The length of the sea wave is 2 m. How many vibrations will the float make in 20 s if the wave propagation

The length of the sea wave is 2 m. How many vibrations will the float make in 20 s if the wave propagation speed is 2.5 m / s?

λ = 2 m.
t = 20 s.
V = 2.5 m / s.
N -?
N = t / T, where t is the time during which N oscillations occur, T is the oscillation period, this is the time of one complete oscillation.
V = λ / T, where V is the wave speed, λ is the wavelength, T is the oscillation period.
T = λ / V.
N = t / λ / V = t * V / λ.
N = 20 s * 2.5 m / s / 2 m = 25.
Answer: the float will make 25 vibrations in 20 seconds.