A train passes a station platform in 32 seconds and a man standing on the platform in 12 seconds. If the speed of the train is 72 km/hr, what is the length of the platform?  Select: A) 340 B) 360 C) 380 D) 400 E) 420
The speed of the train is 72 * 5/18 m/s = 20 m/s   The length of the train is 20 x 12 = 240 m   platform + 240 = 20 * 32= 
<gadget id="calculator">20 * 32</gadget>
<output>640</output>
640 - 240= 
<gadget id="calculator">640 - 240</gadget>
<output>400</output>
400   The answer is 400.
<result>D</result>
A train passes a station platform in 32 seconds and a man standing on the platform in 12 seconds. If the speed of the train is 72 km/hr, what is the length of the platform?