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A road crew must repave a road that is 4/5 miles long. They can repave 1/20 miles each hour. How long will it take the crew to repave the road? Write your answer in simplest form.

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Let's set these equations up first before anything.
4/5 mi and 1/20 mi per hour.
Multiply 4/5 by a number that will get your denominator (5) to 20.
5 x 4 is 20, so multiply 4/5 by 4.
16/20 miles, or, 16 hours, since 1/20 mi is made per hour.
Your answer is 16 hours.
Hope this helps :)