Question

As a part of a 100/9 kilometre marathon race, 38/9 kilometre was to be covered by circles, 10/7 kilometre by boat and the rest on foot, how much distance is covered by walking?

Answer 1

Dear student
$$\begin{gathered} \mathrm{Total}\mathrm{distance}=\frac{100}{9}\mathrm{km} \\ \mathrm{Distance}\mathrm{to}\mathrm{be}\mathrm{covered}\mathrm{by}\mathrm{walking} \\ =\mathrm{Total}\mathrm{distance}-\mathrm{Distance}\mathrm{to}\mathrm{be}\mathrm{covered}\mathrm{by}\mathrm{circles}-\mathrm{Distance}\mathrm{to}\mathrm{be}\mathrm{covered}\mathrm{by}\mathrm{boat} \\ =\frac{100}{9}-\frac{38}{9}-\frac{10}{7} \\ =\frac{700-266-90}{63} \\ =\frac{344}{63}\mathrm{km} \end{gathered}$$
Regards