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### Discussion :: Problems on Trains

1. Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.

2.  A. 12 sec B. 24 sec C. 48 sec D. 60 sec

Explanation :

 Relative speed = = (45 + 30) km/hr =$$(75\times\frac{5}{18})m/sec$$ =$$(\frac { 125 } { 6 } ) m/sec$$

We have to find the time taken by the slower train to pass the DRIVER of the faster train and not the complete train.

So, distance covered = Length of the slower train.

Therefore, Distance covered = 500 m.

Required time =  $$(500\times\frac{6}{125})$$  = 24sec

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