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1. Two trains 200 meters and 150 meters long are running on parallel rails in the same direction at speed of 40 km/hr and 45 km/hr respectively. Time taken by the faster train to cross the slowed train will be:

Solution:
Relative speed = (45 - 40) km/hr = 5 km/hr
= (5×518)  m/sec
= 2518 m/sec
Total distance covered = Sum of lengths of trains = (200 + 150) m = 350 m
∴ Time taken
= (350×1825)   sec
= 252 seconds

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