Problems to try for F block - A block, read up on the Doppler effect

A police car traveling at 30 m/s has a siren that normally blasts a 1000 Hz tone.  Find the frequency you hear when:

A.  The car approaches you

B.  the car drives past you

C.  The car approaches you while you run toward it at 5 m/s

D.  The car has past you while you are running away from it at 5 m/s