A man can row 8 km/h in still water. If the river current flows at 2 km/h, it takes him 3.2 hours to row to a place and back. How far is the place? MCQ with Answer and Explanation

Question

A man can row 8 km/h in still water. If the river current flows at 2 km/h, it takes him 3.2 hours to row to a place and back. How far is the place?

A. 15 km

B. 10 km

C. 12 km

D. 14 km

Answer: Option C

Solution (By JKSSB Mock Tests)

Downstream speed = 8 + 2 = 10 km/h. Upstream speed = 8 - 2 = 6 km/h. Let distance be d. d / 10 + d / 6 = 3.2 => 16d / 60 = 3.2 => 16d = 192 => d = 12 km.

This question belongs to: Maths Time Speed and Distance

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Question #1

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Excluding stoppages, the speed of an inter-city bus is 45 km/h and including stoppages it is 36 km/h. How many minutes does the bus stop per hour?

A. 15 minutes

B. 18 minutes

C. 10 minutes

D. 12 minutes

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Correct Answer: Option D

Explanation:
Stoppage time per hour = (45 - 36) / 45 = 9 / 45 = 1/5 hour. In minutes = (1/5) * 60 = 12 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train passes a standing man in 6 seconds and a 210-meter long platform in 16 seconds. Find the speed of the train.

A. 80 km/h

B. 72 km/h

C. 54 km/h

D. 75.6 km/h

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Correct Answer: Option D

Explanation:
Let length of train be L. Speed = L/6. Also, Speed = (L + 210)/16. Equating them: L/6 = (L+210)/16 => 16L = 6L + 1260 => 10L = 1260 => L = 126 meters. Speed = 126 / 6 = 21 m/s. Speed in km/h = 21 * (18/5) = 378 / 5 = 75.6 km/h.

This question belongs to: Maths Time Speed and Distance