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?

The expression that can be used to calculate his unit rate in miles per hour is:

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

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