Question
Train 'A' having a speed of 20 m/s can cross a man in 7
seconds. The length of train 'B' is 40 metres more than the length of 'A'. If the speed of 'B' is 30 m/sec and both trains are travelling towards each other, then find the time taken by them to cross each other.Solution
Length of train 'A' = 20 × 7 = 140 metres
Length of train 'B' = 140 + 40 = 180 metres
Relative speed = 20 + 30 = 50 m/sec
Required time = (140 + 180) ÷ 50 = 320 ÷ 50 = 6.4 seconds
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