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PROBLEM:
The speed of sound is measured to be 342 m/s on a certain day. What is this in km/h?
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SOLUTION:
We know that 1 km=1000 m and 1 hr=3600 sec.
Convert 342 m/s.
\begin{align*}
342\:\text{m/s} & =\left(342\:\frac{\bcancel{\text{m}}}{\bcancel{\text{s}}}\right)\left(\frac{1\:\text{km}}{1000\:\bcancel{\text{m}}}\right)\left(\frac{3600\:\bcancel{\text{s}}}{1\:\text{hr}}\right) \\
& =1231.2\:\text{km/hr} \ \qquad \ \color{DarkOrange} \left( \text{Answer} \right)
\end{align*}Therefore, the speed of sound in km/hr is 1231.2 km/hr.
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