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1. An athlete runs 200 meters race in 24 seconds. His speed in km/h is

A. 20

B. 24

C. 28.5

D. 30

Solution:

\begin{aligned} Speed of athlete, \\ = \frac{200 m}{24 secs} \\ = \frac{200 \times 18}{5 \times 24} \\ = 30 km/hour \end{aligned}

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