A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 18 sec. What is the length of the platform?
Pick one:
A) 100 m  B) 350 m  C) 25 m  D) 30 m  E) 35 m
Explanation:   Speed = 300/18 = 50/3 m/sec.   Let the length of the platform be x meters.   Then, (x + 300)/39 = 50/3   3x + 900 = 1950 =&gt; x = 350 m.   Answer:350 m
<result>B</result>
A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 18 sec. What is the length of the platform?