The siren of a moving police car emits a sound wave with a frequency of 440 Hz. A stationary observer hears sound of frequency 494 Hz. The speed of sound in the air is $340{\text{ }}m{\text{ }}{s^{ - 1}}$.
What could be the speed and the direction of movement of the car?
1 )
37 ms$^{ - 1}$ directly away from the observer
37 ms$^{ - 1}$ directly towards the observer
3 )
42 ms$^{ - 1}$ directly away from the observer
4 )
42 ms$^{ - 1}$ directly towards the observer
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