In what time will a train 400 meters long cross an electric pole, if its speed is 144 km/hr
Answers:
A) 5 seconds B) 4.5 seconds C) 10 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= Distance/speed   = 400/40= 
<gadget id="calculator">400/40</gadget>
<output>10</output>
10 seconds   Answer: 10 seconds
<result>C</result>
In what time will a train 400 meters long cross an electric pole, if its speed is 144 km/hr