An emergency truck spans 450 meters in 25 seconds. Find its speed in km/h. MCQ with Answer and Explanation

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

A. 64.8 km/h

B. 60 km/h

C. 72 km/h

D. 68 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

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

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Question #1

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A train passes a static observer in 10 seconds and a platform 150 meters long in 16 seconds. Find the length of the train.

A. 300 meters

B. 280 meters

C. 200 meters

D. 250 meters

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Correct Answer: Option D

Explanation:
Time to cross the platform alone = 16 - 10 = 6 seconds. Speed of train = 150 / 6 = 25 m/s. Length of train = Speed * Time to pass observer = 25 * 10 = 250 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man rows downstream 40 km in 4 hours and upstream 24 km in 4 hours. What is the speed of the stream?

A. 3 km/h

B. 2 km/h

C. 4 km/h

D. 1 km/h

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Correct Answer: Option B

Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A runner covers a 400-meter track. The winner finishes in 40 seconds, while the runner-up takes 44 seconds. By what distance does the winner beat the runner-up?

A. 38.5 meters

B. 36.36 meters

C. 34.2 meters

D. 40.0 meters

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Correct Answer: Option B

Explanation:
Speed of runner-up = 400 / 44 = 100 / 11 m/s. Distance covered by runner-up in 40 seconds = (100 / 11) * 40 = 4000 / 11 = 363.63 meters. Winning margin = 400 - 363.63 = 36.36 meters.

This question belongs to: Maths Time Speed and Distance

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