A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 26 sec. What is the length of the platform?  Choose the correct choice from the following answers:
A) 389 m B) 150 m C) 289 m D) 299 m E) 219 m
Speed = 300/26 = 150/13 m/sec.   Let the length of the platform be x meters.   Then, (x + 300)/39 = 150/13   =&gt; x = 150 m.   Answer:150 m
<result>B</result>
A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 26 sec. What is the length of the platform?