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## Homework Statement

Two cars traveling with the same speed move directly away from one another. One car sounds a horn whose frequency is 185 Hz and a person in the other car hears a frequency of 173 Hz. What is the speed of the cars?

## Homework Equations

The Doppler Effect.

## The Attempt at a Solution

I'm not quite sure how to set up a Doppler Effect problem...

Perhaps F(observer) = F(source) (v-vobs)/(v-vsource) ?