A train 110 m long is running with a speed of 60 km/hr. In what time will it pass a man who is running at 6 km/hr. in the direction opposite to that in which the train is going?
5 secs
6 secs
7 secs
10 secs
Explanation:
Speed of train relative to man = 60 + 6 = 66 km/hr.
=> 66 $\times$ 5/18 = 55/3 m/sec.
Time taken to pass the men = 110 $\times$ 3/55 = 6 sec.