A train having a length of 240 m passes a post in 24 seconds. How long will it take to pass a platform having a length of 620 m?
Choose the correct answer.
A) 120 sec	B) 99 sec	C) 89 sec	D) 86 sec	E) 85 sec
Explanation:   v = 240/24 (where v is the speed of the train) = 10 m/s   t = (240+620)/10= 
<gadget id="calculator">(240+620)/10</gadget>
<output>86</output>
86 seconds   Answer: Option 86 sec
<result>D</result>
A train having a length of 240 m passes a post in 24 seconds. How long will it take to pass a platform having a length of 620 m?