# Boats and Streams Questions with Answers: Download PDF > Fifteen boats and streams questions with answers, each solved from the two speeds the question is really about. Free PDF download, no sign-up, no email needed. Source: https://computeprep.com/questions/boats-and-streams --- ## Boats and streams questions with answers Boats and streams questions are speed-distance-time with one extra number. Downstream speed is boat plus current, upstream is boat minus current, and every question in the family is built from that pair. Each walkthrough below writes both speeds out first, which turns the harder round-trip questions into simple substitution. [Download the PDF — 15 questions with answers](https://computeprep.com/questions/boats-and-streams.pdf) Free, ungated, no email. This is the boats and streams questions with answers PDF — the same 15 questions as below, with every worked solution at the back, ready to print. ### How to use this set The 15 questions below are ordered the way an exam block is rather than easiest-first: two gentle openers, then a run of medium, and a hard one every sixth question — 2 of the 15 sit in the hard band. Every question is a boats & streams. Work each question on paper before you open its solution. The walkthrough is the method itself, step for step, so reading it first turns a practice set into a reading exercise and teaches nothing. If you are stuck on the method rather than on one question, the method guide is a better place to start than the next question: [Boats and streams: two speeds, one method](https://computeprep.com/drill-types/boats-and-streams). ### 15 boats and streams questions with answers Every question below was generated by the same engine that mints the ComputePrep daily timed drill, and machine-checked before it reached this page — a multiple-choice question validates its own answer against its own options at generation, and ships only with a walkthrough attached. The walkthrough is the engine's own. #### Question 1 How far does it go? A boat's speed in still water is 8 km/h and the stream flows at 3 km/h. It travels upstream for 2 hours. - 22 - 10 - 30 - 25 - 16 - Upstream speed = 8 − 3 = 5 km/h. - Distance = 5 × 2 = 10 km — the stream must be applied before multiplying. - Answer: 10 km. #### Question 2 How far does it go? A boat's speed in still water is 20 km/h and the stream flows at 3 km/h. It travels upstream for 3 hours. - 60 - 72 - 17 - 69 - 51 - Upstream speed = 20 − 3 = 17 km/h. - Distance = 17 × 3 = 51 km — the stream must be applied before multiplying. - Answer: 51 km. #### Question 3 How far does it go? A boat's speed in still water is 14 km/h and the stream flows at 4 km/h. It travels downstream for 4 hours. - 56 - 76 - 40 - 72 - 18 - Downstream speed = 14 + 4 = 18 km/h. - Distance = 18 × 4 = 72 km — the stream must be applied before multiplying. - Answer: 72 km. #### Question 4 How far does it go? A boat's speed in still water is 4 km/h and the stream flows at 1 km/h. It travels downstream for 5 hours. - 15 - 32 - 34 - 26 - 25 - Downstream speed = 4 + 1 = 5 km/h. - Distance = 5 × 5 = 25 km — the stream must be applied before multiplying. - Answer: 25 km. #### Question 5 What is the speed of the boat in still water? A boat travels downstream at 19 km/h and upstream at 9 km/h. - 14 - 54 - 28 - 22 - 5 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (19 + 9) ÷ 2 = 14 km/h. (The stream is the HALF-DIFFERENCE, 5 km/h.) - Answer: 14 km/h. #### Question 6 What is the speed of the boat in still water? A boat travels downstream at 40 km/h and upstream at 16 km/h. - 68 - 28 - 12 - 24 - 14 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (40 + 16) ÷ 2 = 28 km/h. (The stream is the HALF-DIFFERENCE, 12 km/h.) - Answer: 28 km/h. #### Question 7 How far does it go? A boat's speed in still water is 15 km/h and the stream flows at 6 km/h. It travels upstream for 4 hours. - 90 - 60 - 84 - 36 - 9 - Upstream speed = 15 − 6 = 9 km/h. - Distance = 9 × 4 = 36 km — the stream must be applied before multiplying. - Answer: 36 km. #### Question 8 How far does it go? A boat's speed in still water is 14 km/h and the stream flows at 3 km/h. It travels upstream for 2 hours. - 28 - 37 - 22 - 52 - 34 - Upstream speed = 14 − 3 = 11 km/h. - Distance = 11 × 2 = 22 km — the stream must be applied before multiplying. - Answer: 22 km. #### Question 9 What is the speed of the boat in still water? A boat travels downstream at 12 km/h and upstream at 8 km/h. - 20 - 5 - 2 - 10 - 4 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (12 + 8) ÷ 2 = 10 km/h. (The stream is the HALF-DIFFERENCE, 2 km/h.) - Answer: 10 km/h. #### Question 10 What is the speed of the boat in still water? A boat travels downstream at 19 km/h and upstream at 9 km/h. - 5 - 15 - 28 - 34 - 14 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (19 + 9) ÷ 2 = 14 km/h. (The stream is the HALF-DIFFERENCE, 5 km/h.) - Answer: 14 km/h. #### Question 11 What is the speed of the boat in still water? A boat travels downstream at 20 km/h and upstream at 16 km/h. - 28 - 4 - 2 - 36 - 18 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (20 + 16) ÷ 2 = 18 km/h. (The stream is the HALF-DIFFERENCE, 2 km/h.) - Answer: 18 km/h. #### Question 12 What is the speed of the boat in still water? A boat travels downstream at 12 km/h and upstream at 8 km/h. - 4 - 40 - 10 - 5 - 2 - Downstream = boat + stream, upstream = boat − stream. - Adding: boat = (12 + 8) ÷ 2 = 10 km/h. (The stream is the HALF-DIFFERENCE, 2 km/h.) - Answer: 10 km/h. #### Question 13 How far does it go? A boat's speed in still water is 12 km/h and the stream flows at 5 km/h. It travels upstream for 4 hours. - 7 - 25 - 28 - 21 - 68 - Upstream speed = 12 − 5 = 7 km/h. - Distance = 7 × 4 = 28 km — the stream must be applied before multiplying. - Answer: 28 km. #### Question 14 How far does it go? A boat's speed in still water is 20 km/h and the stream flows at 1 km/h. It travels downstream for 4 hours. - 84 - 34 - 80 - 76 - 21 - Downstream speed = 20 + 1 = 21 km/h. - Distance = 21 × 4 = 84 km — the stream must be applied before multiplying. - Answer: 84 km. #### Question 15 How far does it go? A boat's speed in still water is 4 km/h and the stream flows at 1 km/h. It travels downstream for 5 hours. - 17 - 5 - 25 - 15 - 20 - Downstream speed = 4 + 1 = 5 km/h. - Distance = 5 × 5 = 25 km — the stream must be applied before multiplying. - Answer: 25 km. ### Where these questions come from Most free practice for this topic is a scanned upload or a blog quiz, and neither can tell you a question has exactly one answer. That is the one thing this set can promise: it is minted, not typed. The engine behind it serves ComputePrep's daily timed drill, so the questions here are the same shape as the ones a live round would give you — and there is an unlimited supply of them, which is why this page can be regenerated rather than padded. If you want the method rather than more questions, [Boats and streams: two speeds, one method](https://computeprep.com/drill-types/boats-and-streams) covers the approach, the traps and a worked table. This page and that one deliberately answer different questions: that one is *how do I solve these*, this one is *give me boats and streams questions with the answers*. ### FAQ #### How do I get boat and stream speed from the two given speeds? Boat speed in still water is half the sum of the downstream and upstream speeds; stream speed is half their difference. Those two lines answer a large share of the family directly, and they are worth writing down the moment the question gives you both directions. #### Why is the average speed of a round trip not the mean? Because the upstream leg takes longer than the downstream one for the same distance. The correct figure is the harmonic mean, 2ab/(a + b) with a and b the two speeds — and the arithmetic mean will be sitting among the options. #### Do escalator and aeroplane questions use the same method? Yes. A walker on a moving escalator, or a plane with a tailwind, is the same two-speed structure with different words. Recognising the shape means one method covers what looks like three separate question types. ### More question banks - [Mensuration questions with answers](https://computeprep.com/questions/mensuration) — 15 worked questions and a PDF. - [Average questions with answers](https://computeprep.com/questions/average) — 15 worked questions and a PDF. - [Permutation and combination questions with answers](https://computeprep.com/questions/permutation-and-combination) — 15 worked questions and a PDF. - [All drill types](https://computeprep.com/drill-types) — the method guides behind every bank. ComputePrep is not affiliated with IBPS, SBI, SSC or RBI.