A train passes a standing track worker in 12 seconds and crosses a platform 200 meters long in 22 seconds. Find the length of the train. MCQ with Answer and Explanation

Question

A train passes a standing track worker in 12 seconds and crosses a platform 200 meters long in 22 seconds. Find the length of the train.

A. 300 meters

B. 240 meters

C. 200 meters

D. 250 meters

Answer: Option B

Solution (By JKSSB Mock Tests)

Time taken to cross platform alone = 22 - 12 = 10 seconds. Speed of train = 200 / 10 = 20 m/s. Length of train = Speed * Time to cross worker = 20 * 12 = 240 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person runs around a square track of side 60 meters. If his speed is 12 km/h, how much time does he take to complete one round?

A. 84 seconds

B. 72 seconds

C. 80 seconds

D. 64 seconds

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Correct Answer: Option B

Explanation:
Perimeter of the track = 4 * 60 = 240 meters. Speed = 12 km/h = 12 * (5/18) = 10/3 m/s. Time required = Distance / Speed = 240 / (10/3) = 240 * 3 / 10 = 72 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man rows upstream 14 km and downstream 26 km, taking 4 hours each time. Find the speed of the current.

A. 1.50 km/h

B. 2.00 km/h

C. 1.25 km/h

D. 1.75 km/h

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Correct Answer: Option A

Explanation:
Upstream speed = 14 / 4 = 3.5 km/h. Downstream speed = 26 / 4 = 6.5 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (6.5 - 3.5) / 2 = 3 / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance