If 1/5th part of a tank is filled in one hour. How many hours are required to filled the full tank?

If 1/5th part of a tank is filled in one hour. How many hours are required to filled the full tank?

Explanation

If 1/5 of the tank is filled in 1 hour, the whole tank will be filled in:

Time = 1 / (1/5)

= 1 × 5

= 5 hours