A train passes a platform in 32 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
Choices.
A) 180 meter
B) 240 meter
C) 200 meter
D) 260 meter
E) None of these
Explanation:   Speed of the train = 54 km/hr = (54×10)/32 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 = 32   =&gt; 300+L = 15×32 =480   =&gt; L = 480-300= 
<gadget id="calculator">480-300</gadget>
<output>180</output>
180 meter   180 meternswer: Option 180 meter
<result>A</result>
A train passes a platform in 32 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