A man is holding one end of a board and the another end is on a spool with the outer radius $R$ and the inner radius $r$. A board does not slip on the spool and the spool does not slip on the ground. The man starts to move with the board with a speed $u$.
3) Find the distance traveled by the man if $r = R$.
4) Calculate the time and the distance if $l = 298\mathrm{cm}$, $R = 101\mathrm{cm}$, $r = 86\mathrm{cm}$, $u = 1\mathrm{m/s}$.