SOLUTION: a motor boat can travel 15 miles per hour downstream and 9 miles upstream per hour on a certin river. Fint the rate of the current and the rate at which the boat can travel on stil

Algebra ->  Expressions-with-variables -> SOLUTION: a motor boat can travel 15 miles per hour downstream and 9 miles upstream per hour on a certin river. Fint the rate of the current and the rate at which the boat can travel on stil      Log On


   

Question 272376: a motor boat can travel 15 miles per hour downstream and 9 miles upstream per hour on a certin river. Fint the rate of the current and the rate at which the boat can travel on still water.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
b + c = 15

b - c = 9

adding equations ___ 2b = 24 ___ b = 12

substituting ___ 12 + c = 15 ___ c = 3