SOLUTION: A motorboat can travel 15 miles per hour downstream and 9 moles per hour upstream on a certain river. Find the rate of its current and the rate at which the boat can travel in stil

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: A motorboat can travel 15 miles per hour downstream and 9 moles per hour upstream on a certain river. Find the rate of its current and the rate at which the boat can travel in stil      Log On


   

Question 1122904: A motorboat can travel 15 miles per hour downstream and 9 moles per hour upstream on a certain river. Find the rate of its current and the rate at which the boat can travel in still water
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
speed=x
current=c
x+c=15
x-c=9
add them
2x=24
x=12 mph speed in still water
c=3 mph