Two cars of masses $m_{1}$ and $m_{2}$ are moving in circles of radii $r_{1}$ and $r_{2}$, respectively. Their speeds are such that they make complete circles in the same time $t$. The ratio of their centripetal acceleration is\\
(1) $m_{1}r_{1} : m_{2}r_{2}$\\
(2) $m_{1} : m_{2}$\\
(3) $r_{1} : r_{2}$\\
(4) $1 : 1$