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.

b-w=2

b+w=3

solve. I would add the two equations to eliminate w.

- Algebra -
**Navi**, Thursday, July 28, 2011 at 6:46am
b-w=2

b+w=3 (transpose)

b=3-w (substitute)

3-w-w=2 (combine like terms)

-2w=-1 (cancel -2)

w= 1/2

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