[单选题]
A car starts from rest and acceleqx3f--,h x) l.hjsea,xr i .urrate7 g4csgcwkso6-r jz:9 s uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?
A. $12 \; s$
B. $19 \; s$
C. $21 \; s$
D. $24 \; s$
