An ambulance is traveling East at 20m/s.

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 420Hz. Each of the following cars is traveling down the road as described. Rank the cars according to the frequency the driver will hear. Select 1 for the car which will hear the highest frequency. Remember that if the frequency is the same, select the same rank and skip the next number. I really suggest drawing a picture to help sort this out. Keep in mind the relative speed - How fast does it seem the ambulance is moving towards or away from each driver?
1)A car driving East at a speed of 15m/s. The car is behind the ambulance.
2)A car sitting stationary at the side of the road watching the ambulance moving away.
3)A car driving East at a speed of 20m/s. The car is in front of the ambulance.
4)A car driving East at a speed of 25m/s. The car is ahead of the ambulance.
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