1. The problem statement, all variables and given/known data A group of swimmers is resting in the sun on an off shore raft. They estimate that 2.2 m seperates a trough from an adjacent crest of surface waves on a lake. They count 18 crests that pass by the raft in 31s. How fast are the waves moving? 2. Relevant equations F= 1/t v=wavelength x frequency 3. The attempt at a solution 2.2(2)=4.4= wavelength 4.4 x 31? or 4.4 x 18? or something else?