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

