A train passes a platform in 35 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) 225 meter  D) 200 meter  E) None of these
Explanation:   Speed of the train = 54 km/hr = (54×10)/35 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 = 35   =&gt; 300+L = 15×35 = 525   =&gt; L = 525-300= 
<gadget id="calculator">525-300</gadget>
<output>225</output>
225 meter   Answer: Option 225 meter
<result>C</result>
A train passes a platform in 35 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