A sound wave travels at 340 m/s. How much distance in kilometers does it cover in exactly 15 seconds? MCQ with Answer and Explanation

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A sound wave travels at 340 m/s. How much distance in kilometers does it cover in exactly 15 seconds?

A. 4.8 km

B. 5.4 km

C. 5.7 km

D. 5.1 km

Answer: Option D

Solution (By JKSSB Mock Tests)

Distance = Speed * Time = 340 * 15 = 5100 meters. Converting to kilometers = 5100 / 1000 = 5.1 km.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream.

A. 3.0 km/h

B. 4.0 km/h

C. 3.5 km/h

D. 2.5 km/h

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Correct Answer: Option A

Explanation:
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

Question #2

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A person wins a 100-meter race in 12 seconds, while the runner-up finishes in 13 seconds. By what distance did the winner beat the runner-up?

A. 7.24 meters

B. 7.69 meters

C. 8.12 meters

D. 8.50 meters

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Correct Answer: Option B

Explanation:
Speed of runner-up = 100 / 13 m/s. Distance covered by runner-up in 12 seconds = (100 / 13) * 12 = 1200 / 13 = 92.31 meters. Beat distance = 100 - 92.31 = 7.69 meters.

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Question #3

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A boat crew rows 24 km downstream in 3 hours and logs the same route track upstream in 6 hours. Find the speed of the boat hull in still water.

A. 7 km/h

B. 8 km/h

C. 6 km/h

D. 5 km/h

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Correct Answer: Option C

Explanation:
Downstream speed = 24 / 3 = 8 km/h. Upstream speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 6 km/h.

This question belongs to: Maths Time Speed and Distance

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