A 200 meter long train crosses a platform in 50 seconds while it crosses a signal pole in 42 seconds. What is the length of the platform?
Options:	A) 39.9	B) 37.88	C) 35	D) 38.88	E) 38.09
Speed = [200 / 42] m/sec = 100/21 m/sec.   Let the length of the platform be x meters.   Then, x + 200 / 50 = 100/21   21(x + 200) = 5000 è x = 38.09 m. Answer: 38.09
<result>E</result>
A 200 meter long train crosses a platform in 50 seconds while it crosses a signal pole in 42 seconds. What is the length of the platform?