A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 12 sec. What is the length of the platform?
Pick
A) 187 m  B) 350 m  C) 267 m  D) 287 m  E) 675 m

Rationale: "speed = 300 / 12 = 25 m / sec . let the length of the platform be x meters . then , ( x + 300 ) / 39 = 25 = > x = 675 m . answer : e"
Answer: E