An oil company fills 1 over 12 of a tank in 1 over 4 hour with gasoline. at this rate, which expression can be used to determine how long will it take for the tank to fill completely?

1 over 4 ⋅ 1 over 12 hours
1 over 12 ⋅ 4 hours
1 over 4 ⋅ 12 hours
12 ⋅ 4 hours

plz

giving away all my points for this.(99)

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

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