Runners \(\mathrm{A}, \mathrm{B}\), and \(\mathrm{C}\) run a \(100-\mathrm{m}\) race, each at a constant speed. Runner A takes first place, beating runner B by \(10 \mathrm{~m}\). Runner \(B\) takes second place, beating runner \(C\) by \(10 \mathrm{~m}\). By what time interval does runner \(A\) beat runner \(C\) ? (Express your answer in terms of runner A's total time.)