It takes an airplane 5/12 of a minute to fly 3/4 of a mile. what is the airplanes speed per minute?

To make this a little easier, you would want to turn 3/4 into 9/12, to match 5/12's denominator.

You would then just add 7/1 to both fractions

(5/12+7/1=12/12 or 1 minutes)
(9/12+7/1=16/12=1 1/3)

So your answer would be 1.333... miles per minute

Hope this helps

Subtracting is the opposite of adding