A train clears a platform of 200 meters long in 10 seconds and passes a telegraph post in 5 seconds. The length of the train is :

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A train clears a platform of 200 meters long in 10 seconds and passes a telegraph post in 5 seconds. The length of the train is :

A100 meters

B200 meters

C300 meters

D400 meters

Answer:

B. 200 meters

Read Explanation:

Let speed of train be 'x' m/sec and length of train be 'y' m, then x = (200 + y)/10 x = y/5 y/5 = (200 + y)/10 ⇒ 2y = 200 + y ⇒ 2y – y = 200 ⇒ y = 200

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