An oil company fills 1 over 10 of a tank in 1 over 5 hours. At this rate, which expression can be used to determine how long it will take for the tank to fill completely?

1 over 5 ⋅ 10 hours
1 over 10 ⋅ 5 hours
1 over 5 ⋅ 1 over 10 hour
5 ⋅ 10 hours