Fun logic problem 2: timing 45 seconds with 2 1 minute fuses

Question

same as this one: http://answers.yahoo.com/question/index;_ylt=Ak4eGOFXscBNIp19Ghc2EyHsy6IX;_ylv=3?qid=20080806162618AAQhNGw

Mariko got the answer right.

you have 2 1-minute string fuses and a few matches, how do you time exactly 45 seconds?

Answer 1

fold 1 in half and the other in quarters, and string them end-to-end.

Answer 2

Simultaneously light both ends of one of the fuses and one end of the other fuse. When the first fuse has burned completely, 30 seconds have passed, and the other fuse is half its original length. At this point we light the other end of the second fuse, so that the remaining portion takes an additional 15 seconds to burn. So, you measure out 45 seconds in total.