[单选题]
The graph shows the j *lqja7if, nfw.i7d ,vaxosvbhw9 yyfs 0ug5 .1v::az6k xo,x4riation with time t of the velocity v of a car traveling along a straight and level ys,95gvx6syu f4ow k0zax v :h:x1.obroad.
What time does it take for the car to travel a distance of 31.5 m from t = 0?
