Albert walks 4/5 of a mile in 5/12

of an hour. Which expression can be used to calculate his unit rate in miles per hour?

To find the unit rate in miles per hour, we can use the expression:

(4/5 miles) / (5/12 hours)

This can be simplified by dividing the fraction of miles by the fraction of hours:

(4/5) / (5/12) = (4/5) * (12/5) = 48 / 25

Therefore, Albert's unit rate is 48/25 miles per hour.