A 450 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? Choose the correct option.
A) 600 B) 525 C) 360 D) 370 E) 380
Speed = 450/18= 
<gadget id="calculator">450/18</gadget>
<output>25</output>
25 m/sec.   Let the length of the platform be x meters.   Then, (x + 450)/39= 25   =&gt; x = 975 m.   L=975-450= 
<gadget id="calculator">975-450</gadget>
<output>525</output>
525   Answer: Option 525
<result>B</result>
A 450 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?