A man starts from his home at math xmlns=http://www.w3.org/1998/Math/MathMLmn10/mnmo:/momn00/mn/...

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A man starts from his home at math xmlns=http://www.w3.org/1998/Math/MathMLmn10/mnmo:/momn00/mn/math a.m., walks with a speed of \( 10 \mathrm{kmh}^{-1} \) on a straight road upto market \( 20 \mathrm{~km} \) away, stays at the market till math xmlns=http://www.w3.org/1998/Math/MathMLmn2/mn/math p.m. and returns home by an auto with speed of \( 20 \mathrm{kmh}^{-1} \). Average speed over this interval (from home till returning back to home) is :-
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