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.

Given

• Two 500 m trains run in opposite directions.
• Speeds: slower = 30 km/h, faster driver = 45 km/h.
• Find time taken by the slower train to pass the driver (a point) of the faster train.

Computation
Relative speed = 30 + 45 = 75 km/h = 75 × (5/18) = 20.833... m/sDistance to be covered = length of slower train = 500 mTime = Distance / Relative speed = 500 / 20.833... = 24 s