Question

A boy swims 200m in still water and then returnsback to the point of start in 10 minFinf the speed of his swim in m/s and Km/hr

Answer 1

$$\begin{gathered} \mathrm{Dear}\mathrm{Student}, \\ \mathrm{Let}\mathrm{the}\mathrm{boy}\mathrm{speed}\mathrm{is}\mathrm{x}\mathrm{so} \\ 10\mathrm{minute}=\frac{200}{\mathrm{x}}+\frac{200}{\mathrm{x}} \\ 600=\frac{400}{\mathrm{x}} \\ \mathrm{x}=\frac{3}{2}=1.5\mathrm{m}/\mathrm{s}=\frac{1.5\times 18}{5}=5.4\mathrm{kmph} \\ \mathrm{Regards} \end{gathered}$$