Question
The speed of a train is 72 km/hr and it takes 14 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 11:7.Solution
Let the length of train be x m. According to the question, => 72 x (5/18) = x/14 => x = 280 m Length of the platform = 280 x (11/7) = 440 m Required time = (280 + 440)/20 = 36 seconds
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