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## Homework Statement

a cyclist and a car are approaching each other at the same speed. the car makes a 500 Hz sound at 343 m/s. the cyclist hears the sound as 535 Hz. How fast are they moving?

## Homework Equations

f2 = f1(v/v[tex]\pm[/tex]vs)

## The Attempt at a Solution

535 hz = 500 hz(343 m/s[tex]\div[/tex]343 m/s-vs)

vs = 22.4 m/s

but the answer should be 11 m/s

HELP ??