A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 630 m long?  Options.
A) 22  B) 89  C) 277  D) 278  E) 87
Speed = 240/24= 
<gadget id="calculator">240/24</gadget>
<output>10</output>
10 m/sec.   Required time= (240 + 630)/10= 
<gadget id="calculator">(240 + 630)/10</gadget>
<output>87</output>
87 sec.   Answer: 87
<result>E</result>
A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 630 m long?