Question
The speed of a train is 90 km/hr and it takes 16 seconds
to cross a man. Find the time taken by train to cross a platform if the ratio of the length of the platform to the train length is 13:8.Solution
Let the length of train be x m. According to the question, => 90 x (5/18) = x/16 => x = 400 m Length of the platform = 400 x (13/8) = 650 m {Speed conversion = 90km/hr = 90 Ă— (5/18)m/s = 25 m/s} Required time = (400 + 650)/25 = 42 seconds  Â
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