A train passes a platform in 18 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	Options
A) 120 B) 250 C) 260 D) 230 E) 220
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 = 18   =&gt; 300+L = 15×18 = 270   =&gt; L = 390-270= 
<gadget id="calculator">390-270</gadget>
<output>120</output>
120 meter   120nswer is 120.
<result>A</result>
A train passes a platform in 18 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