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. 6 km/h

B. 7 km/h

C. 4 km/h

D. 5 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

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

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Question #1

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A vehicle covers a certain distance at 48 km/h in 5 hours. How much time will it take to cover the same distance at 60 km/h?

A. 3.5 hours

B. 4.0 hours

C. 5.0 hours

D. 4.5 hours

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Correct Answer: Option B

Explanation:
Distance = 48 * 5 = 240 km. New time required = 240 / 60 = 4 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A person runs at 8 km/h instead of 6 km/h and consequently covers 10 km more in the same timeframe. Find the baseline distance covered at his normal speed.

A. 30 km

B. 35 km

C. 40 km

D. 25 km

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Correct Answer: Option A

Explanation:
Let duration be t hours. Distance difference = 8t - 6t = 2t = 10 km => t = 5 hours. Distance handled at normal speed (6 km/h) = 6 * 5 = 30 km.

This question belongs to: Maths Time Speed and Distance