SOLUTION: the current of a river is 2 miles per hour. a boat travels to a point 8 miles upstream and back again in 3 hours. what is the speed of the boat in still water ?

Algebra ->  Finance -> SOLUTION: the current of a river is 2 miles per hour. a boat travels to a point 8 miles upstream and back again in 3 hours. what is the speed of the boat in still water ?      Log On


   

Question 1170045: the current of a river is 2 miles per hour. a boat travels to a point 8 miles upstream and back again in 3 hours. what is the speed of the boat in still water ?
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
              SPEED     TIME        DISTANCE
UP            r-2       8/(r-2)         8
DOWN          r+2       8/(r+2)         8
TOTAL                   3

8%2F%28r-2%29%2B8%2F%28r%2B2%29=3
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