Two trains running at 36 km/hr and 54 km/hr are running parallel in the opposite direction. If their lengths are 200m and 300m respectively. Then how much time will they take to cross each other?
20 sec
25 sec
30 sec
35 sec
Solution
Relative speed, when the trains are running in the opposite direction = Sum of the speed
Therefore, Relative speed = 36 km/hr + 72 km/hr = 90 km/hr
Relative speed in m/sec = 90 km/hr $\times $ 5/18= 25 m/sec
Distance covered = sum of the lengths of the train = 200 m + 300 m = 500 m
Therefore, time taken $= \dfrac{500}{25} = 20$ sec