In what time will atrain 100 meters long cross an electric pole, if its speed is 144 km/hr.?
A
5 seconds
B
4.5 seconds
C
3 seconds
D
2.5 seconds
Correct Answer: 2.5 seconds
Speed of the train = 144 kmph = 144×185 = 40 m/sec Length of electric pole = 100 meter Time taken to cross the electric pole = 40100 = 2.5 seconds