\[\boxed{\mathbf{217\ (217)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1\ час = 60\ мин.\]
\[1)\ 4\ мин = \frac{4}{60}\ ч = \frac{1}{15}\ ч\]
\[2)\ 10\ мин = \frac{10}{60}\ ч = \frac{1}{6}\ ч\]
\[3)\ 36\ мин = \frac{36}{60}\ ч = \frac{3}{5}\ ч\]
\[4)\ 54\ мин = \frac{54}{60}\ ч = \frac{9}{10}\ ч\]
\[5)\ 72\ мин = \frac{72}{60}\ ч = \frac{6}{5}\ ч\]