1 hr = 3600 s
1000 m = 1 km
speed = distance/time = 50m/10s = 5 m/s = 5 m/s x (3600 s/h) / (1000 m/km) = 18 km/h
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About 365.5 meters a minute.
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Celerity speed of a deep water wave is 16.6 meters per sec. with a wavelength of 166 meters.