A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 620 m long?
Choose the correct answer.
A) 86  B) 89  C) 277  D) 278  E) 291
Speed = 240/24= 
<gadget id="calculator">240/24</gadget>
<output>10</output>
10 m/sec.   Required time= (240 + 620)/10= 
<gadget id="calculator">(240 + 620)/10</gadget>
<output>86</output>
86 sec.   86nswer: 86
<result>A</result>
A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 620 m long?