A train 280 m long, running with a speed of 63 km / hr will pass a tree in	Choices:
A) 15 sec .
B) 16 sec .
C) 18 sec .
D) 20 sec .
E) none

Rationale: "solution speed = ( 63 x 5 / 18 ) m / sec = 35 / 2 msec time taken = ( 280 x 2 / 35 ) m / sec = 16 sec . answer b"
Answer: B