Posted by Taina on Friday, June 24, 2011 at 12:18pm.
Rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.use fivestep problem solving process

math  Reiny, Friday, June 24, 2011 at 1:21pm
Don't know what the "fivestep process" is, but here is how I would solve it ....
let her speed in still water be x km/h
time to go upstream = 10/(x5)
time to go downstream = 10/(x+5)
solving : 10/(x5) + 10/(x+5) = 3
10x + 50 + 10x  50 = 3x^2  75
3x^2  20x  75 = 0
x = (20 ± √1300)/6
= 9.34 km/h or a negative, which we reject
her stillwater speed is 9.34 km/h
Answer This Question
Related Questions
 algebra  rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 ...
 intermediate algebra  Rowing. Abby rows 10km. upstream and 10km. back in a ...
 applications involving quadratic  Abby rows 10 km upstream and 10 km back in a ...
 7th Grade Math  Toni rows a boat 4.5km/h upstream and then turns around and ...
 math  a man rows downstream for one hour and 40 minutes on a river flowing at 2...
 algebra  Abby Tanenbaum paddled her canoe 10 miles upstream, and then paddled ...
 MATH  Abby, Betty, Cassie, and Dale need to cross the river on a boat. The boat...
 math  donna took 3hours to row 18 km upstream. her return trip took 1 hour less...
 Math  Toni rows a boat 4.5 km/h upstream and then turns around and rows 5.5 km/...
 Math  Walking at 4km/h, Bruce can make the roundtrip between his campsite and ...
More Related Questions