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Explanation
In what time will a train 100 meters long cross an electric pole? The length of train is 100 m but given speed is 144 km/h so we will do a couple of things here.
In the first step, we will change speed from km/h to m/sec and then,
Time = Distance/Speed
To Find
Time = ?
Solution
Given speed = 144 km/h
Speed in m/sec = (144 x 1000)/3600
Speed in m/sec = 40 m/sec
Now,
Time = distance/speed
Time = 100/40
Time = 2.5 sec answer
Conclusion
If speed is 144 km/h then a train 100 meters long will cross an electric pole in 2.5 seconds.