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?

Question

A. 4/5 - 5/12

B. 5/12 * 4/5

C. 5/12/4/5

D. 4/5/5/12

Answer 1

To calculate the unit rate in miles per hour, you need to divide the distance walked by the time taken.

In this case, Albert walks \( \frac{4}{5} \) miles in \( \frac{5}{12} \) hours. The expression to find the unit rate (miles per hour) would therefore be:

\[ \text{Unit Rate} = \frac{\text{Distance}}{\text{Time}} = \frac{4/5}{5/12} \]

This matches option D, which is \( \frac{4/5}{5/12} \).

So the correct answer is: D. \( \frac{4}{5} / \frac{5}{12} \).