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 450 kmph
B. 500 kmph and 500 kmph
C.  450 kmph and 500 kmph
D. 500 kmph and 450 kmph

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