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

25 km/hr

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24 km/hr

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50 km/hr

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5 km/hr

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Solution

The correct option is B
24 km/hr

$v_{a v g} = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$

$= \frac{2 \times 20 \times 30}{20 + 30}$

= $\frac{120}{5}$

$= 24$ km/hr

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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

The correct option is B 24 km/hr vavg=2v1v2v1+v2 =2×20×3020+30 =1205 =24 km/hr

The correct option is B
24 km/hr

$v_{a v g} = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$

$= \frac{2 \times 20 \times 30}{20 + 30}$

= $\frac{120}{5}$

$= 24$ km/hr