A train 900 m long passed a pole in 9 sec. How long will it take to pass a platform 800 m long? Select the correct option.
A) 17
B) 18
C) 19
D) 20
E) 21
Speed = 900/9= 
<gadget id="calculator">900/9</gadget>
<output>100</output>
100 m/sec.   Required time= (900 + 800)/100= 
<gadget id="calculator">(900 + 800)/100</gadget>
<output>17</output>
17 sec.   17nswer:17
<result>A</result>
A train 900 m long passed a pole in 9 sec. How long will it take to pass a platform 800 m long?