A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 46.0 vibrations in 25.6 s. A given crest of the wave travels 402 cm along the rope in a time of 13.1 s.
What is the wavelenght? Answer in units of m.

What's your best guess based on what you've learned so far?

From the 402cm in 13.1s you can work out the speed of wave propagation.

From 46 vibrations in 25.6 seconds you can work out the frequency.

Now you just need to use and you're done!

Not so hard when you link it all together!

Please feel free to ask if you need further help.