A sound wave travels a distance 1020 m in 5 minutes. If the length of the three successive crests is 15 m, then calculate the wave speed.

"Length of three crests"? I'm not sure about that. Is the question okay? I'm confused. :/

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  1. three crests span two complete waves.
    Think of a sine wave. max-max is one wavelength, so max-max-max is two wavelengths.

    So, the wavelength is 7.5m

    Now use your formula: speed = wavelength * frequency

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