A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 16 sec. What is the length of the platform? Choose the correct choice from the following choices:
A) 287 m  B) 431.25 m  C) 267 m  D) 287.25 m  E) 656 m
Speed = 300/16 = 75/4 m/sec.   Let the length of the platform be x meters.   Then, (x + 300)/39 = 75/4   =&gt; x = 731.25 m   Answer:431.25 m (431.25)
<result>B</result>
A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 16 sec. What is the length of the platform?