SOLUTION: From a point on a river, two boats are driven in opposite directions, one at 5 mph and the other at 13 mph. In how many hours will they be 90 miles apart?

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Question 33717: From a point on a river, two boats are driven in opposite directions, one at 5 mph and the other at 13 mph. In how many hours will they be 90 miles apart?
Answer by gabbibaker(1) About Me  (Show Source):
You can put this solution on YOUR website!
Basically, you know that 5 mph plus 3 mph equals 18 mph, which is the total of how far both boats go per hour. Take this number, 18, and see how many times it goes into 90. Your answer is, therefore, 5 times. So, it will take 5 hours for the two boats to be 90 miles apart.