Correct Answer - Option 1 : 30 seconds

**Given:**

A 130 m long train crosses a pole in 20 seconds

**Formula used:**

Time = Distance/ Speed

**Calculation:**

Since Time = Distance/ Speed = [Length of train + Length of pole]/Relative Speed and Length of pole = 0

And Relative Speed (RS) = Speed of train + Speed of pole and Speed of pole = 0

RS = Speed of train.

Time = Length of train/Relative Speed

⇒ 20 = 130/Speed of train

⇒ Speed of train = 6.5 m/s

Time taken by the train to cover a distance of 195 m = Distance/Speed

⇒195/6.5 = 30 seconds

**∴ Time taken by the train to cover a distance of 195 m is 30 sec.**

When it is asked for the **time required to cover a certain distance** we have to ignore the length of the object which is covering the distance during calculation.

We should not confuse with **"Time required to cover anothe object of certain length",** in this case we will take total distance cover = Sum of length of the object and the length of the object which is crossing the other.