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**Waves and Energy transfer problem (plz am desperate)**

Well, this is the problem that is breaking my head

the time needed for a water wave to change from the equilibrium level to the crest is 0.18s

a) what fraction of a wavelength is this?

b)what is the period of the wave?

c)What is the frequency of the wave?

I dont really understand this problem because of the little information they give me, and the fact that when i tried to check it with my brother's answer book, the wavelength gave 1/4, but they do not give a formula or say why the WL is 1/4..

Please help me...