how do you figure out frequency?

for example this problem.
What is the frequency, when the wavelenth is 29 and the time is 1minute 42 seconds?

1 answer

You can calculate frequency from
Frequency = (wave speed)/(wavelength)

You have provded a time, not a wave speed. What does that time mean? If it is the time for a wave to travel a known distance D, calculate that wave speed using
V = D/T
and use it in the formula above.