In what time will a train 100 meters long cross an electric pole, if its speed is 72 km/hr	Select:
A) 5 seconds
B) 2.8 seconds
C) 3.5 seconds
D) 2.5 seconds
E) 2.6 seconds
First convert speed into m/sec   Speed = 72*(5/18)= 
<gadget id="calculator">72*(5/18)</gadget>
<output>20</output>
20 m/sec   Time= Distance/speed   = 100/20= 
<gadget id="calculator">100/20</gadget>
<output>5</output>
5 seconds   5 secondsnswer: 5 seconds
<result>A</result>
In what time will a train 100 meters long cross an electric pole, if its speed is 72 km/hr