A 150 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? Choices:
A) 300  B) 175  C) 360  D) 370  E) 380
Speed = 150/18 = 25/3 m/sec.   Let the length of the platform be x meters.   Then, (x + 150)/39 = 25/3   =&gt; x = 325 m.   L=325-150= 
<gadget id="calculator">325-150</gadget>
<output>175</output>
175 m   Answer: Option 175
<result>B</result>
A 150 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?