Speed = 60 * 5/18 = 50/3 m/sec
Length of the train = speed * time = 50/3 * 21 = 350 m
A train running at the speed of 60 km/hr crosses a pole in 21 sec. What is the length of the train?
[A] 350 m
[B] 490 m
[C] 115 m
[D] 210 m
[E] 150 m