In what time will a train 600 meters long cross an electric pole, if its speed is 144 km/hr  Pick one:  A) 5 seconds  B) 4.5 seconds  C) 3 seconds  D) 15 seconds  E) None of these
Explanation:   First convert speed into m/sec   Speed = 144*(5/18)= 
<gadget id="calculator">144*(5/18)</gadget>
<output>40</output>
40 m/sec   Time= 15 secondsistance/speed   = 600/40= 
<gadget id="calculator">600/40</gadget>
<output>15</output>
15 seconds   Answer: 15 seconds
<result>D</result>
In what time will a train 600 meters long cross an electric pole, if its speed is 144 km/hr