How many seconds will a 500 metre long train take to cross a man walking with speed of 3 km/hr in the direction of the moving train if speed of the train is 63 km/hr?

A 25

B 30

C 40

D 45

Correct Answer: Option B

Speed of the train relative to man = (63 - 3) km/hr

= 60 km/hr = 50/3 m/sec

Therefore Time taken to pass the man

=(50 x3 /50) sec= 30 sec.