A train takes 5 seconds to pass an electric pole. If the length of the train is 120 meters, the time taken by it to cross a railway platform 180 meter long, is?

121/2seconds
71/2seconds
61/2 seconds
31/3seconds

Correct Answer: 121/2seconds

Explanation:

Speed of train = (120/5) = 24 m/sec.
Time takes to cross the platform
= (120 + 180)/24
= 12¹/₂

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