The frequency of a wave can be calculated using the formula f = 1/T, where f represents frequency and T represents period. In this case, with a period of 6 seconds, the frequency would be f = 1/6 = 0.1667 Hz. This means that the wave completes 0.1667 cycles in one second.
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The frequency is 6 per 2 seconds = 3 Hz. The period is the reciprocal of the frequency = 1/3 second.
Frequency = 1 / (period) = 1/6th Hz
Speed = (wavelength) times (frequency) = (wavelength) divided by (period) = 30/5 = 6 meters per second
Period = 1 / (frequency) = 1 / 6th of a second = [166 and 2/3] millisecondsSpeed = (wavelength) x (frequency) = 6 x 3 = [18] meters per second
Speed = (wavelength) x (frequency) = (2 x 6) = 12 meters per second.That's the wave's speed. "Velocity" is something different, not just a wordto use when you mean "speed" but you want to sound more technical.