SOLUTION: It takes my father 3h tpo plow our cornfield with his new tractor. Using the old tractor, it takes me 5h. If we both plow for 1h before I go to school, how long will it take him to
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Question 133571: It takes my father 3h tpo plow our cornfield with his new tractor. Using the old tractor, it takes me 5h. If we both plow for 1h before I go to school, how long will it take him to finish the plowing?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add the rates of plowing with the 2 tractors
(1 field / 3 hrs) + (1 field / 5 hrs) = (x fraction of field / 1 hr)
multiply both sides by
This is the fraction of a field they plow
together before school. There is
left for father to finish alone
Let = hours for father to plow of a field
This is just (father's rate = father's rate)
multiply both sides by
multiply both sides by
hrs
This is and hrs or
1 hours and 24 minutes for father to finish plowing the field
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