Question
Length of a train is equal to the length of a platform.
If the train crosses the platform in 50 seconds, then find the time taken by train to cross a pole.Solution
Let the speed of train be 'v' m/s and the length of platform be 'L' metres.
Length of train = 'L' metres
So, (L + L) = '50v'
Or, 2L = 50v
So, 'L' = 25v ---------- (I)
Required time = (L/v)
= (25v/v) [from equation (I) ]
= 25 seconds
Hence, option c.
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