A runner completes a 200-meter race in 25 seconds. Find his speed in km/h. MCQ with Answer and Explanation

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A runner completes a 200-meter race in 25 seconds. Find his speed in km/h.

A. 28.8 km/h

B. 32.4 km/h

C. 30 km/h

D. 24 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Speed in m/s = 200 / 25 = 8 m/s. In km/h = 8 * (18/5) = 144 / 5 = 28.8 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train 150 meters long completely passes a stone in 15 seconds. Find the speed of the train in km/h.

A. 30 km/h

B. 40 km/h

C. 36 km/h

D. 45 km/h

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Correct Answer: Option C

Explanation:
Speed of train = 150 / 15 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A commuter drives to his consulting firm at 30 km/h and arrives 15 minutes late. If he increases his speed to 40 km/h, he arrives 5 minutes early. Find the distance to his firm.

A. 40 km

B. 50 km

C. 45 km

D. 35 km

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Correct Answer: Option A

Explanation:
Time difference = 15 - (-5) = 20 minutes = 20/60 = 1/3 hours. Let distance be d. d/30 - d/40 = 1/3 => (4d - 3d)/120 = 1/3 => d/120 = 1/3 => d = 40 km.

This question belongs to: Maths Time Speed and Distance