SOLUTION: I am having problems figuring this problem out, Juniors 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 t

Question 283318: I am having problems figuring this problem out,
Juniors 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?
can you please help me, and explain the steps. thank you.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
r*t=d
(15+c)*t=12
(15-c)*t=9

t=12/(15+c)
t=9/(15-c)
12/(15+c)=9/(15-c)
4/(15+c)=3/(15-c)
4*(15-c)=3*(15+c)
60-4c=45+3c
15=7c
c = 15/7=2 1/7 mph
t = 7/10*60=42 minutes

RELATED QUESTIONS
I am having a hard time figuring this word problem out. Can you please help. Upstream,... (answered by Fombitz,stanbon)

Juniors boat will go 15 miles per hour in still water. If he can go 12 miles downstream... (answered by ankor@dixie-net.com)

Juniors boat will go 15 miles per hour in still water. If he can go 12 miles downstream... (answered by Grinnell)

Juniors boat will go 15 miles per hour in still water. If he can go 12 miles downstream... (answered by lwsshak3)

I am totally confused on how to begin this problem, if someone could help it would be... (answered by nerdybill)

I need some help please. Juniors boat will go 15 miles per hour in still water. If he (answered by checkley77)

Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream... (answered by solver91311)

Hi I need help with this problem Daniel's boat will go 15 miles per hour in still... (answered by scott8148)

Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream (answered by Nate,mathdude2)