A Car Starts from Rest and Accelerates Uniformly at 3

Multiple Choice

A car starts from rest and accelerates uniformly at 3.0 m/s² toward the north.A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s² toward the north.How long after the second car starts does it overtake the first car?

A) 12 s
B) 19 s
C) 21 s
D) 24 s