Formula:

The speed of a wave (v) is related to its frequency (f) and wavelength (λ) by the following equation:

v = fλ

Calculation:

* Frequency (f): 45 Hz

* Wavelength (λ): 0.1 meters

Substituting the values into the formula:

v = (45 Hz) * (0.1 meters)

v = 4.5 meters per second (m/s)

Therefore, the speed of the wave is 4.5 m/s.