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A boy walks at a speed of 8 km/hr for 1 km and 10 km/h for the next 1 km. What is his average speed for the walk of 2 km ?

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80/7 km/h

80/9 km/h

80/11 km/h

80/13 km/h

answer is B.

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Detailed Solution

$\begin{array}{l} v_{1} = 8 kmph \\ v_{2} = 10 kmph \\ = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}} = \frac{2 \times 8 \times 10}{18} = \frac{80}{9} \\ = 80 / 9 kmph \end{array}$

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