A man can row 15 km/h in still water. He finds that it takes him twice as long to row upstream as to row downstream. Find the speed of the stream. MCQ with Answer and Explanation

Question

A man can row 15 km/h in still water. He finds that it takes him twice as long to row upstream as to row downstream. Find the speed of the stream.

A. 7 km/h

B. 4 km/h

C. 5 km/h

D. 6 km/h

Answer: Option C

Solution (By JKExamLibrary)

Let stream speed be c. Upstream speed = 15 - c, Downstream speed = 15 + c. Given: 2 * (15 - c) = 15 + c => 30 - 2c = 15 + c => 3c = 15 => c = 5 km/h.

This question belongs to: Maths Time Speed and Distance

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Time Speed and Distance Questions

Question #1

Share Report

If a person covers a distance of 120 km in 3 hours, find his speed in meters per second.

A. 12.50 m/s

B. 10.5 m/s

C. 11.11 m/s

D. 13.33 m/s

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Speed = 120 / 3 = 40 km/h. Converting to m/s = 40 * (5/18) = 200 / 18 = 11.11 m/s.

This question belongs to: Maths Time Speed and Distance

Question #2

Share Report

A high-speed train travels at 162 km/h. How many meters does it cover in exactly 8 seconds?

A. 380 meters

B. 360 meters

C. 400 meters

D. 320 meters

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Speed in m/s = 162 * (5/18) = 9 * 5 = 45 m/s. Distance covered in 8 seconds = 45 * 8 = 360 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

Share Report

A runner covers a 400-meter track. The winner finishes in 40 seconds, while the runner-up takes 44 seconds. By what distance does the winner beat the runner-up?

A. 34.2 meters

B. 38.5 meters

C. 40.0 meters

D. 36.36 meters

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Speed of runner-up = 400 / 44 = 100 / 11 m/s. Distance covered by runner-up in 40 seconds = (100 / 11) * 40 = 4000 / 11 = 363.63 meters. Winning margin = 400 - 363.63 = 36.36 meters.

This question belongs to: Maths Time Speed and Distance

Explore All Time Speed and Distance MCQs