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OpenStudy (anonymous):
Every day, Marco runs for 45 minutes and covers 5 miles. How long would it take him to run 8 miles? 9 min 18 min 48 min 72 min
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OpenStudy (saifoo.khan):
Duration : Miles 45 : 5 x : 8 Cross multiply.
Directrix (directrix):
72 min ------- 45 minutes is to 5 miles as M minutes is to 8 miles 45/5 = M/8 9/1 = M/8 M = 9*8 M =72 minutes
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