You have two ropes. Each one takes exactly an hour to burn, but they are not the same length or width, and their width is not uniform (so burning half the length of a rope does not mean half an hour has elapsed).
By burning the ropes, how do you measure exactly 45 minutes? You can burn the ropes however you like.
By burning the ropes, how do you measure exactly 45 minutes? You can burn the ropes however you like.
