Relationship between distance, speed and time

$\overline{){\mathbf{v}}{\mathbf{=}}\frac{\mathbf{d}}{\mathbf{t}}}$

The distance from crest to trough is equal to a half wavelength.

A stationary boat in the ocean is experiencing waves from a storm. The waves move at 59km/h and have a wavelength of 155m. The boat is at the crest of a wave. How much time elapses until the boat is first at the trough of a wave?

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