Question
Train ‘A’ running with a speed of 54 km/hr can cross
a standing goods train of 4 times its length in 35 seconds. Find the time taken by 280 metres long train ‘B’ which is coming from opposite direction of train ‘A’, with a speed of 20 m/s, to cross train ‘A’.Solution
Let the length of train ‘A’ be ‘x’ metres Therefore, length of the goods train = ‘4x’ metres Speed of train ‘A’ = 54 × (5/18) = 15 m/s According to the question, 4x + x = 15 × 35 => 5x = 525 => x = 105 Therefore, time taken by train ‘B’ to cross train ‘A’ = {(105 + 280)/(15 + 20)} = 11 seconds
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