The figure shown below gives the time $\left(\mathrm{t}\right)$ versus position $\left(\mathrm{x}\right)$ graph of three objects $\mathrm{A}, \mathrm{B}$ and $\mathrm{C} .$ Which one of the following is the correct relation between their speeds ${\mathrm{v}}_{\mathrm{A}},{\mathrm{v}}_{\mathrm{B}}$ and ${\mathrm{v}}_{\mathrm{C}},$ respectively at any instant $(\mathrm{t}>0) ?$