# algebra

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rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 hours. The speed of the river is 5km/h.Find Abby's speed in still water.

• algebra -

10/(v-5)+10/(v+5)=3
10(v+5)+10(v-5)=3(v+5)(v-5)
20v=3v^2-75
3v^2-20v-75=0

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