Candle problem

Question

A red candle is 8 inches tall and burns at a rate of 7/10 inch per hour. a blue cans is 6 inches tall and burns at a rate of 1/5 inch per hour. after how many hours will both candles be the same height?

Answer 1

8-.7H = 6=.2H

.9H = 2

H = 2/.9 = 20/9 = 2 2/9 hours = 2.222... hours

= 2 hours and 13 minutes and 20 seconds