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Quant – Boat & Stream – Set 6
Read the following instructions carefully
- The test contains 10 questions.
- Each question has 4 options, of which only one is correct.
- You have to finish the test in 8 minutes.
- You are awarded 1 mark for each correct answer, and 0.25 marks are deducted for each wrong answer.
- There is no negative marking for questions you do not attempt.
- You may pause the test at any time and resume where you left off.
- Your marks, the correct answers and an explanation for every question are shown as soon as you submit.
- You can take this test as many times as you like. A fresh set is drawn each time you reload the page.
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Review this set's questions and answers (opens after you submit the test)
This free practice set from AndamanJobs has 10 questions to be solved in 8 minutes. Every question is listed below with four options. Open Show answer and explanation under a question to see the correct option and why it is correct. Try the timed test above first, then use this list to revise the questions you got wrong.
- A boat takes 2 hours to go 24 km downstream and 6 hours to return the same distance upstream. What is the speed of the stream?
- A. 3 km/h
- B. 6 km/h
- C. 1 km/h
- D. 4 km/h
Show answer and explanation
Answer: D. 4 km/h
Downstream speed = 24/2 = 12 km/h and upstream = 24/6 = 4 km/h. Stream = (12 - 4)/2 = 4 km/h.
- The speed of a boat in still water and the speed of the stream are in the ratio 9 : 4. Find the ratio of the downstream speed to the upstream speed.
- A. 13 : 9
- B. 13 : 5
- C. 9 : 4
- D. 5 : 13
Show answer and explanation
Answer: B. 13 : 5
Take boat = 9k and stream = 4k. Downstream = 13k and upstream = 5k. Ratio = 13 : 5.
- A boat takes 4 hours to go downstream and 6 hours to cover the same distance upstream. If the stream flows at 2 km/h, find the speed of the boat in still water.
- A. 10 km/h
- B. 6 km/h
- C. 12 km/h
- D. 5 km/h
Show answer and explanation
Answer: A. 10 km/h
Same distance: (b + 2) × 4 = (b - 2) × 6. This gives b = 2 × (4 + 6)/(6 - 4) = 10 km/h.
- A man rows 14 km upstream in 4 hours and 30 km downstream in the same time. What is his speed in still water?
- A. 7 1/2 km/h
- B. 5 1/2 km/h
- C. 6 1/2 km/h
- D. 2 1/2 km/h
Show answer and explanation
Answer: B. 5 1/2 km/h
Upstream speed = 14/4 = 3 1/2 km/h and downstream = 30/4 = 7 1/2 km/h. Still water speed = (3 1/2 + 7 1/2)/2 = 5 1/2 km/h.
- A swimmer's speed in still water is 24 km/h and the river flows at 2 km/h. How many minutes will he take to swim 60 km against the current?
- A. 193 7/11 minutes
- B. 163 7/11 minutes
- C. 173 7/11 minutes
- D. 153 7/11 minutes
Show answer and explanation
Answer: B. 163 7/11 minutes
Upstream speed = 24 - 2 = 22 km/h. Time = 60/22 hours = 2 8/11 × 60 = 163 7/11 minutes.
- A boat goes at 10 km/h in still water and the stream flows at 2 km/h. How long will it take to go 72 km upstream?
- A. 11 hours
- B. 6 hours
- C. 9 hours
- D. 7 hours
Show answer and explanation
Answer: C. 9 hours
Upstream speed = 10 - 2 = 8 km/h. Time = 72/8 = 9 hours.
- A boat takes 2 hours to go 40 km downstream and 4 hours to return the same distance upstream. What is the speed of the stream?
- A. 5 km/h
- B. 4 km/h
- C. 8 km/h
- D. 6 km/h
Show answer and explanation
Answer: A. 5 km/h
Downstream speed = 40/2 = 20 km/h and upstream = 40/4 = 10 km/h. Stream = (20 - 10)/2 = 5 km/h.
- A boat takes 1 hour to go downstream and 2 hours to cover the same distance upstream. If the stream flows at 3 km/h, find the speed of the boat in still water.
- A. 9 km/h
- B. 11 km/h
- C. 7 km/h
- D. 13 km/h
Show answer and explanation
Answer: A. 9 km/h
Same distance: (b + 3) × 1 = (b - 3) × 2. This gives b = 3 × (1 + 2)/(2 - 1) = 9 km/h.
- A swimmer's speed in still water is 18 km/h and the river flows at 4 km/h. How many minutes will he take to swim 40 km against the current?
- A. 171 3/7 minutes
- B. 141 3/7 minutes
- C. 181 3/7 minutes
- D. 201 3/7 minutes
Show answer and explanation
Answer: A. 171 3/7 minutes
Upstream speed = 18 - 4 = 14 km/h. Time = 40/14 hours = 2 6/7 × 60 = 171 3/7 minutes.
- A boat goes at 8 km/h in still water and the stream flows at 4 km/h. How long will it take to go 72 km downstream?
- A. 5 hours
- B. 9 hours
- C. 6 hours
- D. 8 hours
Show answer and explanation
Answer: C. 6 hours
Downstream speed = 8 + 4 = 12 km/h. Time = 72/12 = 6 hours.