A sound wave travels at 330 m/s. How long does it take to cover a distance of 6.6 km? MCQ with Answer and Explanation

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A sound wave travels at 330 m/s. How long does it take to cover a distance of 6.6 km?

A. 18 seconds

B. 24 seconds

C. 20 seconds

D. 22 seconds

Answer: Option C

Solution (By JKSSB Mock Tests)

Distance = 6.6 km = 6600 meters. Time taken = 6600 / 330 = 20 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream.

A. 3 hours

B. 5 hours

C. 4 hours

D. 6 hours

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Correct Answer: Option C

Explanation:
Upstream speed = 10 - 3 = 7 km/h. Time taken = 28 / 7 = 4 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A merchant van covers 120 km at 40 km/h, 180 km at 60 km/h and 100 km at 50 km/h. Find the net average speed.

A. 48 km/h

B. 50 km/h

C. 54 km/h

D. 52 km/h

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Correct Answer: Option B

Explanation:
Total distance = 120 + 180 + 100 = 400 km. Total time = (120/40) + (180/60) + (100/50) = 3 + 3 + 2 = 8 hours. Average speed = 400 / 8 = 50 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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The speed of two cyclists are in the ratio 4 : 7. If they cover the same total distance, what is the ratio of the time taken by them?

A. 7 : 4

B. 16 : 49

C. 4 : 7

D. 49 : 16

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Correct Answer: Option A

Explanation:
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/4 : 1/7 = 7 : 4.

This question belongs to: Maths Time Speed and Distance

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