SOLUTION: a boat takes 2 hours longer to go 45 miles up a river than to return. If the boat's speed in still water is 12 mph, what is the rate of the current?

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Question 22601: a boat takes 2 hours longer to go 45 miles up a river than to return. If the boat's speed in still water is 12 mph, what is the rate of the current?
Found 2 solutions by Paul, sgt_spike:
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
2(t+45)=12t
2t+90=12t
10t=90
t=9
hence, the current of still water is 9KMpH.

Answer by sgt_spike(2) About Me  (Show Source):
You can put this solution on YOUR website!
Paul, thanks for trying.
The answer is 3mph
The problem I was having was I could not set it up to get 3mph
here's what I was doing
(45/12-x)-(45/12+x)=2
anyone have any ideas about how to set this distance word probem up?