Question
Train 'A' having a speed of 10 m/s can cross a man in 12
seconds. The length of train 'B' is 210 metres more than the length of 'A'. If the speed of 'B' is 50 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' = 10 × 12 = 120 metres
Length of train 'B' = 120 + 210 = 330 metres
Relative speed = 10 + 50 = 60 m/sec
Required time = (120 + 330) ÷ 60 = 450 ÷ 60 = 7.5 seconds
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