Question 184775
an airplane is traveling with a velocity of 320 km/hr to the North. It is flying against the wind which is blowing to the south at 42 km/hr. What is the actual velocity of the airplane?
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"Actual velocity" is not the correct term.  The plane's actual velocity wrt (with respect to) the air, and any other objects in the same medium going the same direction, is 320 kph.
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What should have been asked for is the ground speed, its speed wrt things on the ground.  That's 320 - 42 = 278 kph.