An elephant can run 1/4 of a mile in 30 seconds. At this rate, which expression can be used to determine how fast an elephant runs in miles per hour?

To find how fast the elephant runs in one hour, we can first find out how fast it runs in 1 minute.

Since 1 minute = 60 seconds, and since the elephant runs 1/4 of a mile in 30 seconds, the elephant runs 1/2 of a mile in 1 minute.

Now, since there are 60 minutes in 1 hour, we can multiply 1/2 by 60 to find that the elephant runs 30 miles per hour.