SOLUTION: Port and Starboard are paddling canoes. They travel 20 miles downstream in 4 hrs. They return upstream in 6 hrs.
A. How fast is the current?
B. How fast can they paddle in still
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Question 774491: Port and Starboard are paddling canoes. They travel 20 miles downstream in 4 hrs. They return upstream in 6 hrs.
A. How fast is the current?
B. How fast can they paddle in still water?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the current
Let = their speed paddling in still water
--------------
Equation for going downstream:
(1)
Equation for going upstream:
(2)
--------------------
(1)
(1)
and
(2)
(2)
------------------
Multiply both sides of (1) by
and add the equations
(2)
(1)
mi/hr
and
(1)
(1)
(1) mi/hr
--------------------
check:
(1)
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
OK
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