A train passes a station platform in 35 sec and a man standing on the platform in 20 sec. If the speed of the train is 54 km/hr. What is the length of the platform?  Choose the correct option:
A) 228
B) 240
C) 225
D) 166
E) 1811
Speed = 54 * 5/18= 
<gadget id="calculator">54 * 5/18</gadget>
<output>15</output>
15 m/sec.   Length of the train= 15 * 20= 
<gadget id="calculator">15 * 20</gadget>
<output>300</output>
300 m.   Let the length of the platform be x m . Then,   (x + 300)/35= 15 =&gt; x = 225 m.   Answer: 225
<result>C</result>
A train passes a station platform in 35 sec and a man standing on the platform in 20 sec. If the speed of the train is 54 km/hr. What is the length of the platform?