A 1200 m long train crosses a tree in 120 sec, how much time will I take to pass a platform 600 m long?	Choices.
A) 266 sec
B) 180 sec
C) 776 sec
D) 166 sec
E) 997 sec

Rationale: "l = s * t s = 1200 / 120 s = 10 m / sec . total length ( d ) = 1800 m t = d / s t = 1800 / 10 t = 180 sec answer : b"
Answer: B