20 hours because 1 mile is 1 hour so 4 miles is 4 hours so if you times the 5 days by the 4 miles/ hours you get 20 hours in 5 days.
This is an example of The Distributive Property.
We can tell this because the number on the outside of the parenthesis on the left side has been distributed to each number inside on the right. You do this by multiplying each number by the number on the outside.
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Why don't you know this its so easy
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