A train 400 m long passed a pole in 40 sec. How long will it take to pass a platform 600 m long?
Choose one:
A) 28 sec	B) 100 sec	C) 85 sec	D) 16 sec	E) 15 sec
Speed = 400/40= 
<gadget id="calculator">400/40</gadget>
<output>10</output>
10 m/sec.   Required time= (400 + 600)/10= 
<gadget id="calculator">(400 + 600)/10</gadget>
<output>100</output>
100 sec.   Answer:100 sec
<result>B</result>
A train 400 m long passed a pole in 40 sec. How long will it take to pass a platform 600 m long?