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Physics help

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You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a frequency of 2 Hz. How fast are the trumpet players marching in m/s?

Details and assumptions
The speed of sound is 340 m/s.
The trumpet players aren't moving very fast.

  • Physics help -

    0.733

  • Physics help -

    it's wrong

  • Physics help -

    the answer is 0.77

  • Physics help -

    @Anonymous is right, the correct given answer is 0.773. Given by nSolve(440/(1 - x/343) = 442, x) / 2

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