An oil company fills of a tank in hour. At this rate, which expression can be used to determine how long it will take for the tank to fill completely? ⋅ 3 hours
⋅ 12 hours
⋅ hour
3 ⋅ 12 hours

1/12 of a tank in  an hour is equal to:

1/12 of a tank in 20 minutes.

Thus we know in an hour, an oil company can fill 3/12 of a tank (60 minutes in an hour).

3 x 4 = 12, and 12/12 = 1(a whole tank), so we multiply 1 (hour) by 4.

Our answer is that it takes 4 hours to fill a tank.

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