An oil company fills 1/12 of a tank in 1/3 hour. at this rate, which expression can be used to determine how long will it take for the tank to fill completely? a. 1/12 x 3 hours b. 1/3 x 12 hours c. 1/3 x 1/12 hour d. 3 x 12 hours

b . hours

Step-by-step explanation:

Given : A oil company fills of a tank in hour.

i.e. Time taken to fill of a tank=   hour.

By using the Unitary method, we multiply 12 on bith the sides of the above expression we get

Time taken to fill  tank=   hour.

⇒ Time taken to fill 1 tank=   hour.

Hence, it will take hours or 4 hours for the tank to fill completely.

Thus , the correct answer is b . hours