Physics - Kinematics Question with Solution | TestHub

Time taken by Rick to cover the distance D is ${\mathrm{t}}_{\mathrm{R}}=\frac{\mathrm{D}}{2}\left(\frac{{\mathrm{v}}_{\mathrm{w}}+{\mathrm{v}}_{\mathrm{R}}}{{\mathrm{v}}_{\mathrm{w}}{\mathrm{v}}_{\mathrm{R}}}\right)$

Time taken by Tim to cover the distance is $t_T=\frac{2D}{V_r+V_w}$

Rick's average speed for covering the distance D is $\frac{2{\mathrm{V}}_{\mathrm{r}}{\mathrm{V}}_{\mathrm{w}}}{{\mathrm{V}}_{\mathrm{r}}+{\mathrm{V}}_{\mathrm{w}}}$

Average speed of Rick for covering distance D is $\frac{{\mathrm{V}}_{\mathrm{r}}+{\mathrm{V}}_{\mathrm{w}}}{2}$