A train travelling at a speed of 63 km/hr crosses a 400 m long platform in 42 seconds. Find the length of the train

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A train travelling at a speed of 63 km/hr crosses a 400 m long platform in 42 seconds. Find the length of the train

A240 m

B265 m

C295 m

D335 m

Answer:

D. 335 m

Read Explanation:

Let the length of the train be ‘x’ m Speed of train = 63 km/hr = 63 × (5/18) = 17.5 m/sec. Time taken = 42 sec. Distance covered = 400 + x ⇒ (400 + x)/42 = 17.5 ⇒ 400 + x = 735 ⇒ x = 735 – 400 ⇒ x = 335 m

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