Question

Two goods train each 500 m long, are running in opposite direction 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.

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

Answer 1

Answer: (B)

24 sec

Relative speed = (45 + 30) km/hr
$=(75\times \frac{5}{18})m/sec$
$=\left(\frac{125}{6}\right)m/sec.$
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.
$\therefore$ Required time $(500\times \frac{6}{125})=24sec.$