A sound wave maps along a valley channel at 330 m/s. How many seconds are required to span a distance length of 9.9 km? MCQ with Answer and Explanation

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A sound wave maps along a valley channel at 330 m/s. How many seconds are required to span a distance length of 9.9 km?

A. 30 seconds

B. 35 seconds

C. 32 seconds

D. 26 seconds

Answer: Option A

Solution (By JKSSB Mock Tests)

Distance = 9.9 km = 9900 meters. Time taken = 9900 / 330 = 30 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train traveling at 72 km/h crosses a static tunnel in 15 seconds. If the length of the train is 100 meters, find the length of the tunnel.

A. 240 meters

B. 220 meters

C. 200 meters

D. 180 meters

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Correct Answer: Option C

Explanation:
Speed of train = 72 * (5/18) = 20 m/s. Total distance covered in 15 seconds = 20 * 15 = 300 meters. Length of tunnel = 300 - 100 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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Two locomotive train units 140 meters and 110 meters long are running along parallel track loops in identical directions at speeds of 52 km/h and 42 km/h respectively. In what timeframe will the faster train clear the slower train completely?

A. 90 seconds

B. 110 seconds

C. 80 seconds

D. 100 seconds

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Correct Answer: Option A

Explanation:
Total path distance = 140 + 110 = 250 meters. Relative speed index in same direction = 52 - 42 = 10 km/h = 10 * (5/18) = 25/9 m/s. Time required = 250 / (25/9) = 250 * 9 / 25 = 10 * 9 = 90 seconds.

This question belongs to: Maths Time Speed and Distance