If the frequency of standing waves is 485 hz , how far apart are two adjacent nodes?

Missing part in the text:
"The velocity of the standing wave is 95.0 m/s"

Solution:
first, we can find the wavelength of the wave, using the relationship between velocity, frequency and wavelength:


Then, we know that the distance between two adjacent nodes of a standing wave is equal to half the wavelength, so their distance is:

Ais the