Hey there!
Since it is 1/3 of an hour for 5 3/4 miles, multiply 5 3/4 x 3 . . .
5 3/4 = 23/4
3 = 3/1
23 x 3 = 69
4 x 1 = 4
Simplifying 69/4 . . .
69/4 = 17 1/4 <-----------
Sarah's rate is 17 1/4 miles per hour.
Hope this helps you.
Have a great day!
