A train covers a distance of 90 km in 20 min. If it takes 9 sec to pass a telegraph post, then the length of the train is?	Choose one
A) 675  B) 680  C) 685  D) 690  E) 695
Speed = (90/20 * 60) km/hr = (270 * 5/18) m/sec = 75 m/sec.   Length of the train = 75 * 9= 
<gadget id="calculator">75 * 9</gadget>
<output>675</output>
675 m.   675nswer: Option 675
<result>A</result>
A train covers a distance of 90 km in 20 min. If it takes 9 sec to pass a telegraph post, then the length of the train is?