A) 9 1/3
1) We can find that unit rate by setting a proportion. But before that, we need to convert those Mixed Numbers into improper fractions:
[tex]\begin{gathered} 10\text{ }\frac{1}{2}=\frac{2\times10+1}{2}=\frac{21}{2} \\ 1\frac{1}{8}=\frac{8\times1+1}{8}=\frac{9}{8} \end{gathered}[/tex]km hours
21/2 -------- 9/8
x-------------------- 1
21/2x = 9/8
2)
[tex]\begin{gathered} \frac{21}{2}=\frac{9}{8}x \\ \\ x=\frac{28}{3}\text{ }\Rightarrow9\frac{1}{3} \end{gathered}[/tex]Cross multiplying it we have 28/3 as an improper fraction, and that rewritten as Mixed Number is equal to 9 1/3
3) Hence, Xavier makes 9 1/3 km per hour A) 9 1/3
