2019 Cayley Problem 18

Carl and André are running a race. Carl runs at a constant speed of x m/s. André runs at a constant speed of y m/s. Carl starts running, and then André starts running 20 s later. After André has been running for 10 s, he catches up to Carl. The ratio y : x is equivalent to

\textbf{(A)}\ 20 : 1\quad \textbf{(B)}\ 2 : 1\quad \textbf{(C)}\ 1 : 3\quad \textbf{(D)}\ 3 : 1\quad \textbf{(E)}\ 1 : 2

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Cayley contests here.