A car travels from $A$ to $ B $ at a speed of $20\,\,km/hr$ and returns at a speed of $30\,\,km/hr$. The average speed of the car for the whole journey is............$km/hr$
A car travels from $A$ to $ B $ at a speed of $20\,\,km/hr$ and returns at a speed of $30\,\,km/hr$. The average speed of the car for the whole journey is............$km/hr$
$25$
$24$
$50$
$5$
A car travels from $A$ to $ B $ at a speed of $20\,\,km/hr$ and returns at a speed of $30\,\,km/hr$. The average speed of the car for the whole journey is............$km/hr$
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\;km/hr$
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