A 1200 m long train crosses a tree in 120 sec, how much time will I take to pass a platform 300 m long?  Choose the correct choice from the following answers
A) 176 sec	B) 190 sec	C) 178 sec	D) 150 sec	E) 276 sec

Rationale: "l = s * t s = 1200 / 120 s = 10 m / sec . total length ( d ) = 1500 m t = d / s t = 1500 / 10 t = 150 sec answer : d"
Answer: D