1. The problem statement, all variables and given/known data Two people are fishing from small boats located 30m apart. Waves pass through the water and each person's boat bobs up and down 15 times in 1 minute. At a time when one boat is on a crest, the other boat is in a trough, and there is one crest between the two boats. What is the speed of the waves? 2. Relevant equations 3. The attempt at a solution Found the frequency, 0.25Hz, and then want to use dxm / L = m λ ... Not sure what the Xm would be though, or L for that matter. It must not be the correct equation..