A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream. MCQ with Answer and Explanation

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A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream.

A. 4.0 km/h

B. 3.5 km/h

C. 2.5 km/h

D. 3.0 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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An emergency truck spans 450 meters in 25 seconds. Find its speed in km/h.

A. 68 km/h

B. 64.8 km/h

C. 60 km/h

D. 72 km/h

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Correct Answer: Option B

Explanation:
Speed = 450 / 25 = 18 m/s. In km/h = 18 * (18/5) = 324 / 5 = 64.8 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A sound wave tracking along a canyon paths at 340 m/s. Find the total distance wrapped by the sound wave in exactly 25 seconds.

A. 7.5 km

B. 9.5 km

C. 9.0 km

D. 8.5 km

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Correct Answer: Option D

Explanation:
Distance covered = Speed * Time = 340 * 25 = 8500 meters = 8.5 km.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train cross a pole in 12 seconds. If the speed of the train is 72 km/h, what is the length of the train?

A. 320 meters

B. 200 meters

C. 240 meters

D. 280 meters

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Correct Answer: Option C

Explanation:
Speed = 72 * (5/18) = 20 m/s. Length = Speed * Time = 20 * 12 = 240 meters.

This question belongs to: Maths Time Speed and Distance

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