The answer depends on what kind of miles you are using. There are 1.8 km per Nautical Mile and only 1.584 km in a Statue Mile.
Thus 150km/1.8=83.33 Nautical M/hr and 150km/1,584=94.6969 Statue m/hr.
The Nautical mile is 6000 feet and the Statute mile is 5280 feet
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