Two trains running in the same direction at 40 km/hr and 22 km/hr completely pass one another in 1 minute. If the length of the 1st train is 125 m, then what will be the length of 2nd train.
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Solution
Relative speed of trains = 40 - 22 = 18 km/hr ∵ 18 km/hr = 5 m/sec Let the length of second train = L m Time taken to cross each other = L+1255 ∴L+1255=60⇒ L = 175 m