How many seconds will a 420 metre long train take to cross a man running with a speed of 6 km/hr in the direction of the moving train if the speed of the train is 30 km/hr?
Choose the correct choice from the following answers
A) 25 B) 63 C) 40 D) 45 E) 60
Explanation :   Speed of train relatively to man = ( 30 - 6)km/hr   = 24 km /hr   = (24x 5 / 18)m/sec   = 6.66 m/sec   Time taken to pass the man = (420 / 6.66)sec = 63 sec.   Answer : 63
<result>B</result>
How many seconds will a 420 metre long train take to cross a man running with a speed of 6 km/hr in the direction of the moving train if the speed of the train is 30 km/hr?