*Question 01*

**In what time will a train 100 meters long cross an electric pole, if its speed be 144 km/hr.?**

Given, Length of the train = 100 meter

Speed of the train = 144 km/hr.

= 144 x (5/18) meter/sec. = 40 meter/sec.

Since, Speed of the train = (Length of the train/ Time Taken to cross the pole)

Therefore, Time taken = (Length of train/Speed of the train)

= (100/40) Sec.

= 2.5 seconds.

**Hence 2.5 seconds is the answer**