Question
Length of a train is one-third of the length of a
platform. If the train crosses the platform in 48 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 '3L' metres.
Length of train = (1/3) X 3L = 'L' metres
So, (3L + L) = '48v'
Or, 4L = 48v
So, 'L' = 12v ---------- (I)
Required time = (L/v)
= (12v/v) [from equation (I) ]
= 12 seconds
Hence, option c.
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