A train passes a station platform in 30 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?
Choose the correct choice.
A) 320
B) 340
C) 360
D) 380
E) 400
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 * 30= 
<gadget id="calculator">20 * 30</gadget>
<output>600</output>
600 - 240= 
<gadget id="calculator">600 - 240</gadget>
<output>360</output>
360   The answer is 360.
<result>C</result>
A train passes a station platform in 30 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?