A body moves from A to B with a constant speed of $20 k m / h$ and then from B to A with a constant speed of $30 k m / h$ . The average speed in $k m / h$ of the body is :

25

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24

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0

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10

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Solution

The correct option is B $24$

$Average Speed = \frac{Total distance}{Total time} = \frac{X + X}{\frac{X}{20} + \frac{X}{30}} = \frac{2 \times 30 \times 20}{30 + 20} = 24 k m / h$

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A body moves from A to B with a constant speed of 20 km/h and then from B to A with a constant speed of 30 km/h. The average speed in km/h of the body is :

The correct option is B 24Average Speed=Total distanceTotal time=X+XX20+X30=2×30×2030+20=24 km/h

A body moves from A to B with a constant speed of $20 k m / h$ and then from B to A with a constant speed of $30 k m / h$ . The average speed in $k m / h$ of the body is :

The correct option is B $24$

$Average Speed = \frac{Total distance}{Total time} = \frac{X + X}{\frac{X}{20} + \frac{X}{30}} = \frac{2 \times 30 \times 20}{30 + 20} = 24 k m / h$