Discussion Forum

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.

Answer:

Explanation:

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

Distance covered $=(500+500)$ m $=1000$ m.

Required time $=\left(1000\times\frac{6}{125}\right)$ sec = 48 sec.