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The stationary boat will start moving as air pressure moves from high to low temperature. the same property is used here to move stationary boat.  
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On a stationary sail boat, air is blown from a fan attached to the boat. The boat will remain at rest as there is no external force acting on the boat.
The air blown from the fan is a part of the boat. A force acts on the sail of the boat which is equal and opposite to reaction force acting on the fan. So the net force on the system is 0.
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