A boy goes to his school at 1/3rd of the speed at which he returns from his school. Average speed during the whole trip (i.e. one round) is 24 km/h. What is the speed of the boy while he was going to his school?

Speed while going to school = x/3 Speed while returning = x Average speed = (2 × S_{1} × S_{2})/(S_{1} + S_{2}) => 24 = (2 × x/3 × x)/(x/3 + x) => x = 48 Speed while going to school = 48/3 = 16 km/hr

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