Speed of the wave, v = 90 m/s

Frequency of the wave, f = 60 Hz

To Find:

Wavelength of the wave, λ

The wavelength of a wave is given by the formula:

$$\lambda = \frac{v}{f}$$

Substituting the given values into the formula, we get:

$$\lambda = \frac{90 \text{ m/s}}{60 \text{ Hz}}$$

$$\lambda = 1.5 \text{ m}$$

Therefore, the wavelength of the wave is 1.5 meters.