math
posted by liz on .
A blue candle is twice as long as a red one. The blue takes 6 hours to burn out and red takes 15 hours. After 5 hours, what fractional part of each is left?
Thanks for your help!

6/6  5/6 = 1/6
15/15  5/15 = 10/15 = 2/3
Why does the longer candle take longer to burn?? 
what is 15/6?
what is 15/15?