Two trains of equal length are running on parallel lines in different direction at 40 km/h and 32 km/h. The faster train passes the slower train in 36 seconds. The length of each train is-

Question: Two trains of equal length are running on parallel lines in different direction at 40 km/h and 32 km/h. The faster train passes the slower train in 36 seconds. The length of each train is-

Solution:
Let
The length of each train = x metres.
Then, distance covered = 2x metres.
Relative speed = (40 + 32)km/hr
= 72 km/h
= 72 × (5/18) m/sec
= 20 m/sec

ATQ,
2x = 20 × 36
⇒ 2x = 720
∴ x = 360