Light rope 1 on both ends, and rope 2 on 1 end. Once rope 1 is gone, 30 minutes have past, and light the other end of rope 2. Once rope 2 is gone, it has been 4

Light rope 1 on both ends, and rope 2 on 1 end. Once rope 1 is gone, 30 minutes have past, and light the other end of rope 2. Once rope 2 is gone, it has been 45 minutes.