A train traveling at 72 kmph crosses a platform in 31 seconds and a man standing on the platform in 18 seconds. What is the length of the platform in meters? Choose the correct choice from the following answers.
A) 240 meters	B) 260 meters	C) 420 meters	D) 600 meters	E) Cannot be determined
Speed of train = 72 * (5/18)= 
<gadget id="calculator">72 * (5/18)</gadget>
<output>20</output>
20 m/s   Lets consider the man as a stationery point on the platform.   Crossing the point gives us the length of the train.   Lt= 20 * 18= 
<gadget id="calculator">20 * 18</gadget>
<output>360</output>
360 m.   Crossing the platform gives us the length of trainlength of platform.   L(t+p)= 20 * 31= 
<gadget id="calculator">20 * 31</gadget>
<output>620</output>
620 m.   So, length of platform= 620 - 360= 
<gadget id="calculator">620 - 360</gadget>
<output>260</output>
260 m   IMO, Answer   260 meters
<result>B</result>
A train traveling at 72 kmph crosses a platform in 31 seconds and a man standing on the platform in 18 seconds. What is the length of the platform in meters?