To solve this problem, you must apply the proccedure shown below:
1. The problem gives the following information: Harold walks 3/4 miles in each 5/6 hours. Therefore, you have to divide 3/4 miles by 5/6 hours, as below:
unit rate=(3/4)(5/6)
unit rate=(3x6)(4x5)
unit rate=18/20
3. When you simplify, you obtain:
unit rate=9/10
4. Therefore, as you can see, the answer is: Harold's unit rate is 9/10.