In what time will a train 100 meters long cross an electric pole, if its speed is 180 km/hr	Choices: A) 5 seconds B) 4.5 seconds C) 3 seconds D) 2 seconds E) None of these
Explanation:   First convert speed into m/sec   Speed = 180*(5/18)= 
<gadget id="calculator">180*(5/18)</gadget>
<output>50</output>
50 m/sec   Time= 2 secondsistance/speed   = 100/50= 
<gadget id="calculator">100/50</gadget>
<output>2</output>
2 seconds   Answer: 2 seconds
<result>D</result>
In what time will a train 100 meters long cross an electric pole, if its speed is 180 km/hr