SOLUTION: with the current, joe can row a canoe 3 miles in 12 mins. Against the current, he requires 18 minutes to row same distance. HOw fast does joe row in still water, and how fast is

Question 284246: with the current, joe can row a canoe 3 miles in 12 mins. Against the current, he requires 18 minutes to row same distance. HOw fast does joe row in still water, and how fast is the current?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
with the current, joe can row a canoe 3 miles in 12 mins. Against the current, he requires 18 minutes to row same distance. HOw fast does joe row in still water, and how fast is the current?
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With Current:
distance = 3 miles ; time = 1/5 hr ; rate = 3/(1/5) = 15 mph
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Against Current:
distance = 3 miles ; time = 3/5 hr ; rate = 3/(3/5) = 5 mph
-------------------------------------------------------
Equations:
b + c = 15 mph
b - c = 5 mph
----------------------
2b = 20
b = 10 mph (speed of the boat in still water)
-------------------------
Substitute to solve for "c":
10 + c = 15
c = 5 mph (speed of the current)
===================================
Cheers,
Stan H.
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