When Famke charges her phone, it gains $2$ percentage points each minute. When Famke uses her phone, it loses $5$ percentage points each minute. Once, Famke used her phone for some time, and then charged it for twice the amount of time she used it. In the end, her phone *lost* $10$ percentage points. **How long did Famke use her phone and how long did she charge it?** [[☃ radio 1]]