A train passes a platform in 30 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
Pick:	A) 150 meter	B) 240 meter	C) 200 meter	D) 260 meter	E) None of these
Explanation:   Speed of the train = 54 km/hr = (54×10)/30 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 = 30   =&gt; 300+L = 15×30 = 450   =&gt; L = 450-300= 
<gadget id="calculator">450-300</gadget>
<output>150</output>
150 meter   150 meternswer: Option 150 meter
<result>A</result>
A train passes a platform in 30 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