A 300 m long train crosses a platform in 51 sec while it crosses a signal pole in 18 sec. What is the length of the platform?
Choose one:
A) 287	B) 350	C) 828	D) 277	E) 550

Rationale: "speed = 300 / 18 = 50 / 3 m / sec . let the length of the platform be x meters . then , ( x + 300 ) / 5 a = 50 / 3 3 x + 900 = 2550 = > x = 550 m . answer : e"
Answer: E