A boy travels from $A$ to $B$ at a speed of $2.5 km/hr$ and returns at a speed of $0.5 km/hr$ . The average speed of the boy for the whole journey is

1 km/hr

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0.83 km/hr

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1.2 km/hr

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1.5 km/hr

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Solution

The correct option is B $0.83 km/hr$
If the distance travelled is same, then
$average speed = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}} = \frac{2 \times 2.5 \times 0.5}{2.5 + 0.5}$
$= \frac{2.5}{3} = 0.83 km/hr$

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A boy travels from A to B at a speed of 2.5 km/hr and returns at a speed of 0.5 km/hr. The average speed of the boy for the whole journey is

The correct option is B 0.83 km/hrIf the distance travelled is same, then average speed =2v1v2v1+v2=2×2.5×0.52.5+0.5 =2.53=0.83 km/hr

A boy travels from $A$ to $B$ at a speed of $2.5 km/hr$ and returns at a speed of $0.5 km/hr$ . The average speed of the boy for the whole journey is

The correct option is B $0.83 km/hr$
If the distance travelled is same, then
$average speed = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}} = \frac{2 \times 2.5 \times 0.5}{2.5 + 0.5}$
$= \frac{2.5}{3} = 0.83 km/hr$