1. Light the first fuse from the both ends and the second from one end.
2. When the first one burns out, light the second end of the second fuse.
It'll burn for 15 mins.

>I've given this puzzle before but I figured why not.
>
>1. There are two fuses of any length.
>2. Each fuse burns exactly 1 hour.
>3. The fuses do not burn evenly. For example 1/10 of the fuse could take 1/2 an hour and the remaining 9/10ths could take 1/2 an hour.
>
>4. You must, using both fuses, come up with a way to find a 15 minute interval.
>
>( obviously there are no clocks of any kind )