A 300 m long train crosses a platform in 45 sec while it crosses a signal pole in 18 sec. What is the length of the platform?
Select the correct option:
A) 287
B) 350
C) 828
D) 450
E) 122
Speed = 300/18 = 50/3 m/sec.   Let the length of the platform be x meters.   Then, (x + 300)/45 = 50/3   3x + 900 = 2250 =&gt; x = 450 m.   Answer: 450
<result>D</result>
A 300 m long train crosses a platform in 45 sec while it crosses a signal pole in 18 sec. What is the length of the platform?