A 425 meter long train crosses a platform in 55 seconds while it crosses a signal pole in 40 seconds. What is the length of the platform?
Choices:
A) 155.68 B) 160 C) 159.38 D) 180 E) 175
Speed = [425 / 40 m/sec = 42.5/4 m/sec.   Let the length of the platform be x meters.   Then, x + 425 / 55= 42.5/4   4(x + 425) = 2337.5 è x =159.38 m. Answer: 159.38
<result>C</result>
A 425 meter long train crosses a platform in 55 seconds while it crosses a signal pole in 40 seconds. What is the length of the platform?