A man can row 8 km/h in still water. If the river is running at 4 km/h, it takes him 6 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 is running at 4 km/h, it takes him 6 hours to row to a place and back. How far is the place?

A. 24 km

B. 16 km

C. 20 km

D. 18 km

Answer: Option D

Solution (By JKSSB Mock Tests)

Downstream speed = 8 + 4 = 12 km/h. Upstream speed = 8 - 4 = 4 km/h. Let distance be d. d/12 + d/4 = 6 => 4d/12 = 6 => d/3 = 6 => d = 18 km.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car travels a distance of 240 km at a certain speed. If the speed is increased by 10 km/h, it takes 4 hours for the journey. Find the original speed.

A. 45 km/h

B. 55 km/h

C. 60 km/h

D. 50 km/h

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Correct Answer: Option D

Explanation:
New speed = 240 / 4 = 60 km/h. Since new speed is original speed + 10 km/h, the original speed = 60 - 10 = 50 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train 120 meters long passes an entry post light in 6 seconds. How many seconds will it require to cross a terminal platform bridge 240 meters long?

A. 20 seconds

B. 22 seconds

C. 18 seconds

D. 15 seconds

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Correct Answer: Option C

Explanation:
Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform bridge layout = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance