A 300 meter long train crosses a platform in 45 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?	Answers:  A) 99  B) 450  C) 350  D) 882  E) 281
Speed = [300 / 18] m/sec = 50/3 m/sec.   Let the length of the platform be x meters.   Then, x + 300 / 45 = 50/3   3(x + 300) = 2250 è x = 450m.   Answer: 450
<result>B</result>
A 300 meter long train crosses a platform in 45 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?