A 450 m long train crosses a platform in 39 sec while it crosses a signal pole in 18 sec. What is the length of the platform? Select.
A) 600
B) 525
C) 360
D) 370
E) 380

Rationale: "speed = 450 / 18 = 25 m / sec . let the length of the platform be x meters . then , ( x + 450 ) / 39 = 25 = > x = 975 m . l = 975 - 450 = 525 answer : option b"
Answer: B