SOLUTION: Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of th

Algebra ->  Expressions-with-variables -> SOLUTION: Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of th      Log On


   

Question 348643: Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let c = speed of current

Downstream:

rate = c + 15

time = c

distance = 12


Upstream:

rate = c - 15

time = c

distance = 9


Equation:


12/(c + 15) = 9/(c - 15)


Solve the fractional equation for c to find your answer.