Pepe and Alfredo are resting on an offshore raft after...

Question

Pepe and Alfredo are resting on an offshore raft after a swim. They estimate that 3.0 m separates a trough and an adjacent crest of surface waves on the lake. They count 14 crests that pass by the raft in 20.0 s. Calculate how fast the waves are moving.

__________m/s

Answer 1

If it is 3 m trough to crest then it is 6 m crest to crest

(6 * 14)/20 = 4.2 m/s

QED