A sonic pulse registers a speed of 340 m/s. How many seconds will it take to span a straight distance line of 8.5 km? MCQ with Answer and Explanation

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A sonic pulse registers a speed of 340 m/s. How many seconds will it take to span a straight distance line of 8.5 km?

A. 22 seconds

B. 30 seconds

C. 28 seconds

D. 25 seconds

Answer: Option D

Solution (By JKSSB Mock Tests)

Distance = 8.5 km = 8500 meters. Time taken = 8500 / 340 = 25 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A bicycle wheel has a radius of 28 cm. How many revolutions are mandatory to span a total course line of 880 meters?

A. 550

B. 500

C. 450

D. 600

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Correct Answer: Option B

Explanation:
Circumference = 2 * (22/7) * 28 = 176 cm = 1.76 meters. Total course line = 880 meters. Number of revolutions = 880 / 1.76 = 500.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car travels a distance of 300 km at a certain speed. If the speed is increased by 15 km/h, it takes 4 hours for the journey. Find the original speed.

A. 60 km/h

B. 65 km/h

C. 55 km/h

D. 70 km/h

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Correct Answer: Option A

Explanation:
New speed = 300 / 4 = 75 km/h. Since new speed is original speed + 15 km/h, the original speed = 75 - 15 = 60 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A car covers a certain distance at a speed of 48 km/h in 50 minutes. With what speed should it run to decrease the time of journey by 10 minutes?

A. 64 km/h

B. 54 km/h

C. 60 km/h

D. 72 km/h

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Correct Answer: Option C

Explanation:
Original time = 50 mins. New time = 50 - 10 = 40 mins. S1 * T1 = S2 * T2 => 48 * 50 = S2 * 40 => S2 = (48 * 50) / 40 = 60 km/h.

This question belongs to: Maths Time Speed and Distance

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