What occurs when waves overlap

If you are talking about ocean waves crashing into each other, they would probably mostly cancel out with just a bit of motion left over. If you are talking about things like frequency and amplitude, overlapping waves would combine and amplify or suppress each other, depending on their direction, position, frequency and amplitude. If the two waves complement each other, they amplify; if they conflict with each other, they are suppressed.

Divide the velocity, 3 m/s, find the wavelength, 20m, and we find that the frequency is 0.15HZ. Or .15 cycles per second. Then we find the reciprocal of that number; 1 over 0.15 will give us the value of 6.67. That tells us that the wave period is 6.67 seconds.