A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:

[A]. 48 km/hr

[B]. 54 km/hr

[C]. 66 km/hr

[D]. 82 km/hr

✅ The correct answer is option D.
Let the speed of the second train be x km/hr.

Relative speed
= (x + 50) km/hr

(x + 50) x
5

m/sec

250 + 5x

m/sec.

Distance covered = (108 + 112) = 220 m.

220
= 6

250 + 5x

250 + 5x = 660
x = 82 km/hr.

66. A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is: