A wave on the surface of the ocean with wavelength 44m is, Ask an Expert

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A wave on the surface of the ocean with wavelength 44m is travelingeast at a speed of 18m/s relative to the ocean floor. If on, this stretch of ocean surface, a powerboat is moving 15m/s (relative tothe ocean floor), how often does the boat encounter a wave crest,if the boat is traveling a) west and b) east?

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