Question

A train can cross a pole and a platform of 300 meters long in 8 sec and 20 sec respectively. Find the time taken by the train to cross another platform having length 250 meters.

A 18 sec Correct Answer Incorrect Answer
B 19 sec Correct Answer Incorrect Answer
C 20 sec Correct Answer Incorrect Answer
D 21 sec Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

Let the length of the train be ‘x’ meters. According to question, => x/8 = (x + 300)/20 => 20x = 8x + 2400 => x = 200  The speed of the train = 200/8 = 25 m/s Required time taken by train to cross another platform = (200 + 250)/25 = 18 sec 

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