Answer:
63 minutes
Explanation:
You can use a proportion to figure this one out.
8 miles/84 minutes = 6 miles/x minutes
Cross multiply:
(6 miles)(84 minutes) = (8 miles)(x minutes)
504 = 8x
x = 63 minutes
You do 84/8 to find how long it takes Rita to run one mile, which is 10.5 minutes per mile. The you do 10.5x6 which equals 63 minutes to do 6 mile
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