Subject :NSO Class : Class 8

A body goes from point X to point Y with a speed of 10 m s^{-1}. It comes back to X with a speed of 20 m s^{-1}. The average speed of the body during the journey is ______.

A15 m s^{-1}

B16.6 m s^{-1}

C13.3 m s^{-1}

D30 m s^{-1}

Hi, I am a bit confused about this question... How could the answer possibly be 'C'? The answer is most obviously A... Please comment.

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Class : Class 9

shoulda be option A average of 10 and 20 is 15, NOT 13.3