A car starts from Bengaluru, goes $50 \mathrm{km}$ in a straight line towards South, immediately turns around and returns to Bengaluru. The time taken for this round trip is $2 \mathrm{h}.$ The magnitude of the average velocity of the car for this round trip

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 $(\mathrm{t}>0) ?$

In the given velocity $\left(\mathrm{v}\right)$ versus time $\left(\mathrm{t}\right)$ graph, accelerated and decelerated motions are respectively represented by line segments