SOLUTION: It takes a boat 6.5 hours to travel 117miles upstream against the current. If the speed of the current is 5mph, what is the speed of the boat in still water?

Question 499411: It takes a boat 6.5 hours to travel 117miles upstream against the current. If the speed of the current is 5mph, what is the speed of the boat in still water?
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
The speed of the boat going upstream (against the current) =
s -c : the speed in still water - the speed of the current
.
d = rt is the distance equation
d = 117 (given)
.
t = 6.5 hr (given)
.
c = 5 mph (given)
.
Substitute the knows (givens):
.
117 = (s-5)*6.5
.
Divide both sides by 6.5
18 = (s-5)
18 = s -5
.
Add 5 to both sides
23 = s
s = 23
.
The speed of the boat in still water is 23.
.
Done.
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