Two ice skaters, with masses of \(75 \mathrm{~kg}\) and \(55 \mathrm{~kg}\), stand facing

\(\mathbb{N T}\) each other on a \(15-\mathrm{m}\)-wide frozen river. The skaters push off against each other, glide backward straight toward the river's edges, and reach the edges at exactly the same time. How far did the \(75 \mathrm{~kg}\) skater glide?