Correct Answer - Option 1 : 2.5 seconds

**Given:**

Length of the train = 100 meters

Speed of the train = 144 km/hr

**Formula used:**

Time = Distance/Speed

**Calculation:**

Time in second = 100/(144 × (5/18))

⇒ 100/40 = 2.5

**∴ A train will take time 2.5 second to cross an electric pole **