1997 Pascal Problem 24

Two ships, one 200 metres in length and the other 100 metres in length, travel at constant but different speeds. When travelling in opposite directions, it takes 10 seconds for them to completely pass each other. When travelling in the same direction, it takes 25 seconds for them to completely pass each other. The speed of the faster ship, in metres per second, is

\textbf{(A)}\ 12\quad \textbf{(B)}\ 14\quad \textbf{(C)}\ 18\quad \textbf{(D)}\ 21\quad \textbf{(E)}\ 30

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 Pascal contests here.