if the distance between crest were 1.5 meters apart, and 2 crest pass the pole each second, what would be the speed of the wave ?

Answer 1

period= .5 seconds, wavelength= 1.5

wavelenght*frequency= speed
1.5m*1/.5sec= .75m/s

Answer 2

You are sitting in a rowboat on a lake, watching waves created by passing motorboat. If you have count 4 crest every
second and the crest are 5 ft apart, what is the speed of the water waves?