Respuesta :
Answer
3.88 hours
Explanation:
If it takes Kim 11 hours to proof a chapter of Hawkes Learning Systems Introductory Algebra book, this shows that she will prove 1/11 of the chapter in 1 hour.
Similarly, if it took Bethany 6hrs to proof the same chapter, she will prove 1/6 of the chapter in 1hour
If x is the time take to read a chapter if the work together, the time it will take them working together is given as
[tex]\begin{gathered} \frac{1}{x}=\frac{1}{11}+\frac{1}{6} \\ \frac{1}{x}=\frac{6+11}{66} \\ \frac{1}{x}=\frac{17}{66} \end{gathered}[/tex]Cross multiply
[tex]\begin{gathered} 17x=66\times1 \\ 17x=66 \\ x=\frac{66}{17}=3\frac{15}{17}=3.88hours \end{gathered}[/tex]Hence the time it will take them to work together is 3.88 hours
