The cruising speed of the aircraft is 500 kmph. If there is a head wind of 50 kmph, then the air speed and ground speed of the aircraft respectively will be A. 450 kmph and 500 kmph B. 500 kmph and 450 kmph C. 450 kmph and 450 kmph D. 500 kmph and 500 kmph

The correct answer is: A. 450 kmph and 500 kmph

Air speed is the speed of the aircraft relative to the air. Ground speed is the speed of the aircraft relative to the ground.

When there is a head wind, the aircraft has to travel further in the same amount of time, so its ground speed is reduced. The air speed remains the same.

In this case, the air speed is 500 kmph and the head wind is 50 kmph. The ground speed is therefore 500 – 50 = 450 kmph.