A. 12 sec
B. 24 sec
C. 48 sec
D. 60 sec
Relative Speed = (45 + 30) km/hr
= 75 x (5/18) m/sec
= (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 x (6/125) = 24 sec