A man rows a distance of 16 km downstream in 2 hours and returns upstream in 4 hours. Find the speed of the river current. MCQ with Answer and Explanation

Question

A man rows a distance of 16 km downstream in 2 hours and returns upstream in 4 hours. Find the speed of the river current.

A. 2.5 km/h

B. 1.5 km/h

C. 2.0 km/h

D. 3.0 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Downstream speed = 16 / 2 = 8 km/h. Upstream speed = 16 / 4 = 4 km/h. Speed of current = (8 - 4) / 2 = 4 / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car covers a certain distance at an average speed of 48 km/h in 5 hours. At what speed must it travel to cover the same distance in 4 hours?

A. 60 km/h

B. 70 km/h

C. 65 km/h

D. 55 km/h

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Correct Answer: Option A

Explanation:
Distance = 48 * 5 = 240 km. New required speed = 240 / 4 = 60 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A cyclist covers 900 meters in exactly 3 minutes. Find his speed in km/h.

A. 16 km/h

B. 22 km/h

C. 20 km/h

D. 18 km/h

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Correct Answer: Option D

Explanation:
Time = 3 minutes = 180 seconds. Speed = 900 / 180 = 5 m/s. In km/h = 5 * (18/5) = 18 km/h.

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Question #3

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Walking at 6/7 of his typical speed, a clerk reaches his documentation terminal 14 minutes late. What is his typical time?

A. 90 minutes

B. 96 minutes

C. 84 minutes

D. 78 minutes

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Correct Answer: Option C

Explanation:
New speed = 6/7 of typical speed => New time = 7/6 of typical time. Difference = 1/6 of typical time = 14 minutes. Typical time = 14 * 6 = 84 minutes.

This question belongs to: Maths Time Speed and Distance

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