Posted by Amber on Monday, January 14, 2008 at 11:03pm.
on a canoe trip, Rita paddled upstream (against the current) at an average speed of 2 mi/hr relative to the riverbank. on the return trip downstream (with the current), her average speed was 3 mi/hr. find rita's paddling speed in still water and the speed of the river's current.
dealing w/ substitution and elimination

Algebra  bobpursley, Tuesday, January 15, 2008 at 12:05am
let w be the water speed
let b be the boat speed in still water.
bw=2
b+w=3
solve. I would add the two equations to eliminate w.

Algebra  Navi, Thursday, July 28, 2011 at 6:46am
bw=2
b+w=3 (transpose)
b=3w (substitute)
3ww=2 (combine like terms)
2w=1 (cancel 2)
w= 1/2
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