A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?  Choose the correct choice:
A) 320
B) 600
C) 700
D) 350
E) 500
Speed = 300/18 m/sec = 50/3 m/sec   (x+300/39) = 50/3   x=350 m   ANSWER 350
<result>D</result>
A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?