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1. A man covers half of his journey at 6 km/h and the remaining half at 3 km/h. His average speed is

A. 9 km/h

B. 4.5 km/h

C. 4 km/h

D. 3 km/h

Solution:

\begin{aligned} Average speed \\ = \frac{2 x y}{x + y} \\ = \frac{2 \times 6 \times 3}{6 + 3} \\ = \frac{36}{9} \\ = 4 kmph \end{aligned}

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