Verified answer

Step-by-step explanation:

Speed of the train =144 kmph=144×

18

5

=40 m/sec

Length of electric pole =100 meter

Time taken to cross the electric pole =

40

100

=2.5 seconds

You know that when train passes the standing object it covers its own distance

Speed =distance /time

144km/hr=100/time

144 ×5/18= 100 /time

Time =2.5sec.