A train 180 m long moving at the speed of 20 m/sec. over-takes

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A train 180 m long moving at the speed of 20 m/sec. over-takes a man moving at a speed of 10m/sec in the same direction. The train passes the man in :

1. 6 sec
2. 9 sec
3. 18 sec
4. 27 sec

Correct Option: C

Relative speed of man and train = 20 – 10 = 10m/sec.

∴ Required time =	180	= 18 seconds
	10