In what time will a train 100 meters long cross an electric pole, if its speed is 126 km/hr Choose the correct answer.
A) 8.5 seconds B) 2.86 seconds C) 3.5 seconds D) 2.5 seconds E) 2.6 seconds
First convert speed into m/sec   Speed = 126*(5/18)= 
<gadget id="calculator">126*(5/18)</gadget>
<output>35</output>
35 m/sec   Time= Distance/speed   = 100/35 = 2.86 seconds   Answer: 2.86 seconds
<result>B</result>
In what time will a train 100 meters long cross an electric pole, if its speed is 126 km/hr