[单选题]
A car starts from rest and p0cq0 m4a jl+n5:nbrn es:+w92whl 9-o/fpg4 j cuiqm accelerates 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. $24 \; s$
