A train 420 m long, running with a speed of 63 km/hr will pass a tree in?  Choose the correct choice from the following answers: A) 36 sec B) 16 sec C) 17 sec D) 88 sec E) 12 sec
Speed = 63 * 5/18 = 35/2 m/sec   Time taken = 420 * 2/35 = 36 sec   36 secnswer:36 sec
<result>A</result>
A train 420 m long, running with a speed of 63 km/hr will pass a tree in?