A man rows downstream 48 km in 4 hours and upstream 24 km in 4 hours. Find the speed of the boat in still water. MCQ with Answer and Explanation

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A man rows downstream 48 km in 4 hours and upstream 24 km in 4 hours. Find the speed of the boat in still water.

A. 9 km/h

B. 10 km/h

C. 12 km/h

D. 8 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Downstream speed = 48 / 4 = 12 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed in still water = (Downstream speed + Upstream speed) / 2 = (12 + 6) / 2 = 9 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train running at 90 km/h overtakes a cyclist riding at 18 km/h in the same direction in 10 seconds. Find the length of the train.

A. 180 meters

B. 240 meters

C. 200 meters

D. 220 meters

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Correct Answer: Option C

Explanation:
Relative speed = 90 - 18 = 72 km/h = 72 * (5/18) = 20 m/s. Length of train = Relative speed * Time = 20 * 10 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A person can walk at 5 km/h. How many meters can he cover in 12 minutes?

A. 1200 meters

B. 900 meters

C. 1000 meters

D. 1100 meters

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Correct Answer: Option C

Explanation:
Speed = 5 km/h = 5000 meters / 60 minutes = 83.33 meters per minute. Distance in 12 minutes = 83.33 * 12 = 1000 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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A motorboat tracks 36 km downstream in 3 hours and spans the same stretch upstream in 4.5 hours. Find the speed of the current.

A. 2.5 km/h

B. 2.0 km/h

C. 1.5 km/h

D. 3.0 km/h

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Correct Answer: Option B

Explanation:
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 4.5 = 8 km/h. Speed of current = (12 - 8) / 2 = 4 / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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