A train 300 m long passed a pole in 10 sec. How long will it take to pass a platform 600 m long?
Choose the correct choice from the following options.
A) 80	B) 90	C) 100	D) 110	E) 120
Speed = 300/10= 
<gadget id="calculator">300/10</gadget>
<output>30</output>
30 m/sec.   Required time= (300 + 600)/10= 
<gadget id="calculator">(300 + 600)/10</gadget>
<output>90</output>
90 sec.   Answer:90
<result>B</result>
A train 300 m long passed a pole in 10 sec. How long will it take to pass a platform 600 m long?