Two tuning forks with natural frequencies 340 Hz each move relative to a stationary observer. One fork moves away from the observer while the other moves towards the observer with the same speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning forks.
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For beats with moving sources:
\[
f_{\text{beat}} = |f_1 - f_2|
\]
Use Doppler formula carefully for approaching and receding sources.