A train passes a platform in 25 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) 75 B) 25 C) 26 D) 23 E) 22
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 = 20   =&gt; 300+L = 15×25 = 375   =&gt; L = 375-300= 
<gadget id="calculator">375-300</gadget>
<output>75</output>
75 meter   75nswer is 75.
<result>A</result>
A train passes a platform in 25 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