A train passes a platform in 36 seconds. The same train passes a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, The length of the platform is	Choose the correct choice from the following answers
A) 280 meter	B) 240 meter	C) 200 meter	D) 260 meter	E) None of these
Explanation:   Speed of the train = 54 km/hr = (54×10)/36 m/s = 15 m/s   Length of the train = speed × time taken to cross the man = 15×20 = 300 m   Let the length of the platform = L   Time taken to cross the platform = (300+L)/15   =&gt; (300+L)/15 = 36   =&gt; 300+L = 15×36 = 540   =&gt; L = 540-300= 
<gadget id="calculator">540-300</gadget>
<output>240</output>
240 meter   Answer: Option 240 meter
<result>B</result>
A train passes a platform in 36 seconds. The same train passes a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, The length of the platform is