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A car travels from $A$ to $B$ at a speed of $20 \mathrm{~km} / \mathrm{hr}$ and returns at a speed of $30 \mathrm{~km} / \mathrm{hr}$. The average speed of the car for the whole journey is
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24 km/hr
Distance average speed $=\frac{2 v_1 v_2}{v_1+v_2}=\frac{2 \times 20 \times 30}{20+30}$ $=\frac{120}{5}=24 \mathrm{~km} / \mathrm{hr}$
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