What is the period of a wave that propels a surfer at a speed of 5.0m/s if the crests are 2.0m apart?

Question

I've been researching for an hour already for my Physics assignment and this is the only question that doesn't have an answer yet. Any help will be appreciated!

Answer 1

wavelength  = speed* period

so period = 2/5=0.4s

Answer 2

T = lambda/v = 2.0m/(5.0 m/s) = 0.4 s