HELPP!!! You mother and father took turns driving on a 640-mile trip that took 11 hours to complete. Your mother drove at a constant speed of 55 mph and your father drove at a constant speed of 60 mph. a) How long did your mother drove (i tried doing cross multiply and divide but that didnt work ?)

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HELPP!!! You mother and father took turns driving on a 640-mile trip that took 11 hours to complete. Your mother drove at a constant speed of 55 mph and your father drove at a constant speed of 60 mph. a) How long did your mother drove (i tried doing cross multiply and divide but that didnt work ?)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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m- Hours mother drove the car and f - no. of hours father drove the car. Then acc. to ques. m+f = 11 and 55*m + 60*f = 640 (Total distance traveled) 55*m + 60*(11-m) = 640 55m + 660 - 60m = 640 5m= 660-640 5m = 20 m = 4. I hope it helps !!
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