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. 60 km/h

B. 72 km/h

C. 64.8 km/h

D. 68 km/h

Answer: Option C

Solution (By JKExamLibrary)

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 120 meters long crosses a platform 180 meters long in 15 seconds. Find the speed of the train in km/h.

A. 72 km/h

B. 64 km/h

C. 75 km/h

D. 80 km/h

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Correct Answer: Option A

Explanation:
Total distance = 120 + 180 = 300 meters. Speed = 300 / 15 = 20 m/s. Conversion to km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A mechanic wheel tracks 3000 revolutions to bridge a course distance of 2640 meters. Find the radius size of the wheel.

A. 18 cm

B. 16 cm

C. 12 cm

D. 14 cm

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Correct Answer: Option D

Explanation:
Distance wrapped in 1 turn revolution = 2640 / 3000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm.

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Question #3

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A train passes a static post in 15 seconds. If the speed of the train is 72 km/h, what is the length of the train?

A. 320 meters

B. 280 meters

C. 300 meters

D. 350 meters

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Correct Answer: Option C

Explanation:
Speed of train = 72 * (5/18) = 20 m/s. Length of train = Speed * Time = 20 * 15 = 300 meters.

This question belongs to: Maths Time Speed and Distance

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