A train passes a station platform in 48 sec and a man standing on the platform in 40 sec. If the speed of the train is 36 km/hr. What is the length of the platform?	Choose the correct choice:
A) 80  B) 120  C) 60  D) 90  E) 50
Speed = 36 * 5/18= 
<gadget id="calculator">36 * 5/18</gadget>
<output>10</output>
10 m/sec.   Length of the train= 10 * 40= 
<gadget id="calculator">10 * 40</gadget>
<output>400</output>
400 m.   Let the length of the platform be x m . Then,   (x + 400)/48= 10 =&gt; x = 80 m.   80nswer: 80
<result>A</result>
A train passes a station platform in 48 sec and a man standing on the platform in 40 sec. If the speed of the train is 36 km/hr. What is the length of the platform?