A 1200 m long train crosses a tree in 120 sec, how much time will I take to pass a platform 500 m long?	Choose the most appropriate option.
A) 266 sec  B) 170 sec  C) 776 sec  D) 166 sec  E) 997 sec

Rationale: "l = s * t s = 1200 / 120 s = 10 m / sec . total length ( d ) = 1700 m t = d / s t = 1700 / 10 t = 170 sec answer : b"
Answer: B