In what time will a train 100 meters long cross an electric pole, if its speed is 144 km/hr
Choices.
A) 5 seconds	B) 4.5 seconds	C) 3 seconds	D) 2.5 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= 2.5 secondsistance/speed   = 100/40= 
<gadget id="calculator">100/40</gadget>
<output>5/2 = around 2.5</output>
2.5 seconds   Answer: 2.5 seconds
<result>D</result>
In what time will a train 100 meters long cross an electric pole, if its speed is 144 km/hr