A train 120 m long passed a pole in 20 sec. How long will it take to pass a platform 780 m long?
Choose the correct option.
A) 150	B) 170	C) 160	D) 100	E) 120
Speed = 120/20= 
<gadget id="calculator">120/20</gadget>
<output>6</output>
6 m/sec.   Required time= (120 + 780)/6= 
<gadget id="calculator">(120 + 780)/6</gadget>
<output>150</output>
150 sec.   150nswer: Option 150
<result>A</result>
A train 120 m long passed a pole in 20 sec. How long will it take to pass a platform 780 m long?