A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 24 sec. What is the length of the platform?  Answers:
A) 389 m
B) 350 m
C) 187.5 m
D) 299 m
E) 219.5 m
Speed = 300/24 = 25/2 m/sec.   Let the length of the platform be x meters.   Then, (x + 300)/39 = 25/2   =&gt; x = 187.5 m.   Answer:187.5 m
<result>C</result>
A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 24 sec. What is the length of the platform?