Question

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

Answer 1

1/12 tank  /   1/4 hour
=(1/12)/(1/4)  tank / hour
=(1/12)*(4/1) tank / hour
=1/3 tank/hour

1 tank will take
1 tank /(1/3)tank/hour
=1/(1/3) hours
=3 hours