SOLUTION: From a point on a river, two boats are driven in opposite directions, one at 9 miles per hour and the other at 13 miles per hour. In how many hours will they be 44 miles apart?

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Distance + distance = total distance


9*t      + 13*t     = 44


22*t = 44  ====>  t =  = 2.


Answer.  In 2 hours.