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**Test tomorrow...please help!!!!**

## Homework Statement

A student in a parked car honks the horn, which has a `proper' frequency of 310.00 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 342 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.

## Homework Equations

## The Attempt at a Solution

Fs = 310 Hz

Fo = 342 Hz

Vo = 0 m/s

V = 340 m/s

Vs = ?

I know

Vs = (Fs - Fo / Fs + Fo) * V

if the object is going away from the observer

but how I do calculate if the object is approaching the person?