Given:
It takes 1.5 s to complete one wave.
One wave covers 25 m.
To find the speed of the wave.
Step-by-step explanation:
The frequency of the wave will be

The wavelength of the wave is

The speed of the wave can be calculated by the formula

On substituting the values, the speed of the wave will be

Thus, the speed of the wave is 16.67 m/s