There is man locked up in a room, which has no
windows or any way out except for a firmly
locked door that can't be unlocked or destroyed
by any means. There is an open tap at a corner of
the room from which great amounts of water get
into the room.
What can the man do to escape from drowning,
if he only has a large rope and a bucket
that can hold up to 5 liters of water ?
He can close the tap with bucket and rope to avoid drowning.