A train 120 meters long crosses a platform 280 meters long in 20 seconds. Find the speed of the train in km/h. MCQ with Answer and Explanation

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A train 120 meters long crosses a platform 280 meters long in 20 seconds. Find the speed of the train in km/h.

A. 84 km/h

B. 64 km/h

C. 72 km/h

D. 80 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Total distance = 120 + 280 = 400 meters. Speed = 400 / 20 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A container ship routes a distance of 120 nautical miles at a speed of 15 knots (nautical miles per hour). Find the total time of the passage.

A. 6 hours

B. 12 hours

C. 8 hours

D. 10 hours

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Correct Answer: Option C

Explanation:
Time = Distance / Speed = 120 / 15 = 8 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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Two cities A and B are 360 km apart. A car goes from A to B at 40 km/h and returns to A at 60 km/h. Find the average speed of the car.

A. 48 km/h

B. 50 km/h

C. 52 km/h

D. 55 km/h

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Correct Answer: Option A

Explanation:
Average speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A boat logs 18 km downstream in 1.5 hours and manages the return tract upstream in 4.5 hours. Find the net speed of the river current stream.

A. 4.5 km/h

B. 4.0 km/h

C. 3.5 km/h

D. 5.0 km/h

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Correct Answer: Option B

Explanation:
Downstream speed = 18 / 1.5 = 12 km/h. Upstream speed = 18 / 4.5 = 4 km/h. Speed of current stream = (12 - 4) / 2 = 8 / 2 = 4 km/h.

This question belongs to: Maths Time Speed and Distance

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