2012 Pascal Problem 7

Anna walked at a constant rate. The graph shows that she walked 600 metres in 4 minutes. If she continued walking at the same rate, how far did she walk in 6 minutes?

\textbf{(A)}\ 700\text{ m}\quad \textbf{(B)}\ 750\text{ m}\quad \textbf{(C)}\ 800\text{ m}\quad \textbf{(D)}\ 900\text{ m}\quad \textbf{(E)}\ 1000\text{ m}

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.