The information you have been given allows you to calculate the frequency and the wavelength. In fact, they have told you what the wavelength is already.
The period is P = 12.85/5 = 2.57 s and the frequency is 1/P = ___ s^-1.
The product of wavelength and frequency is the wave speed.
That should enable you to do the calculation.
For a certain transverse wave, the distance between two successive crests is 1.89 m, and 5 crests pass a given point along the direction of travel every 12.84 s. Calculate the wave speed.
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