Two trains are moving in the same direction at 65 kmph and 45 kmph respectively. The faster train crosses a man in the slower train in 18 seconds. The length of the first train is:
A
120 m
B
180 m
C
100 m
D
145 m
Correct Option:
C
Explanation
The Physics: Relative speed = 65 − 45 = 20 km/h = 50/9 m/s. Length = speed × time = (50/9) × 18 = 100 m.
