Albert wants 4/5 of a mile in 5/12 of an hour which expression can be used to calculate the unit rate in miles per hour

To calculate the unit rate in miles per hour, you can use the following expression:

(4/5) / (5/12) miles per hour

This expression represents the distance Albert wants (4/5 of a mile) divided by the time it takes to travel that distance (5/12 of an hour), which will give you the unit rate in miles per hour.