A train speeds past a pole in 11 seconds and a platform 120 m long in 22 seconds. Its length is?	Choose the correct choice:
A) 128 B) 177 C) 199 D) 120 E) 150

Rationale: let the length of the train be x meters and its speed be y m / sec . they , x / y = 11 = > y = x / 11 x + 120 / 22 = x / 11 x = 120 m . answer : d
Answer: D