- #1

Kosmos77

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## Homework Statement

A boat takes 2.80 hours to travel 30.0 km down a river, then 4.50 hours to return. How fast is the river flowing

## Homework Equations

Vac = Vab + Vbc

## The Attempt at a Solution

I wasn't quite sure how to use the formula that the professor gave us which is above for this particular problem. The way I see it, since the problem doesn't say their is a change in acceleration, I'm thinking the speed of the boat IS the speed of the river seeing as it is saying "down" a river... so I just took 30 / 2.8 which gives me the speed of the boat but... It's not the answer.