applications involving quadratic
posted by Elisa .
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.

she went the same distance.
(v+5)3=(v5)10)
3v+15=10v50
7v=65
v=65/7 km/hr
What does this have to do with quadratics? 
thats what my mathbook said. That why I needed help thank you bobpursley.