Mathematics

Problem

A sprinter runs at

12\,\text{m s}^{-1}

. What is this speed in

\text{km h}^{-1}

? a)

36\,\text{km h}^{-1}

43.2\,\text{km h}^{-1}

32.4\,\text{km h}^{-1}

72.0\,\text{km h}^{-1}