SOLUTION: from a point on a river,two boats are driven in opposite directions, ones at 9 miles per hour and the other at 13 miles per hour. in how many hours will they be 66 miles apart?

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Question 903311: from a point on a river,two boats are driven in opposite directions, ones at 9 miles per hour and the other at 13 miles per hour. in how many hours will they be 66 miles apart?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
D = rt
9t + 13t = 66
22t = 66
t = 3hrs is in how many hours will they be 66 miles apart?