Discussion
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
Answer: B
Convert both quantities to the units the answer needs.
\[ 600 \text{ m} = 0.6 \text{ km}, \qquad 5 \text{ min} = \frac{1}{12} \text{ h} \]
\[ v = \frac{0.6}{1/12} = 7.2 \text{ km/hr} \]
Equivalently, 2 m/s multiplied by \( \tfrac{18}{5} \) gives the same 7.2 km/hr.
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