A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 8 sec. What is the length of the platform?  Choose the correct answer:	A) 287 m	B) 350 m	C) 1267 m	D) 1287 m	E) 1162.5 m

Rationale: "speed = 300 / 8 = 75 / 2 m / sec . let the length of the platform be x meters . then , ( x + 300 ) / 39 = 75 / 2 = > x = 1162.5 m . answer : e"
Answer: E