Dora has three candles, which will burn for 3, 4 and 5 hours, respectively. If she wants to keep two candles burning at all times, what is the greatest number of hours she can burn the candles? (Dora has a clock that she can use to time the candles.)
Hey there, Guest!
So this question has already been semi-answered here: https://web2.0calc.com/questions/dora.
Building off of what HighSchoolCalculus said...
We would burn the 5 hour one first with the 4-hour candle.
That would automatically give us 5 hours.
Then, when the first 4 hours are up, we would replace it with the 3-hour candle.
That gives us one more hour because of the limits of the 5-hour candle.
Now, do the addition:
5+1= 6 hours
Hope this helped! :)
( ﾟдﾟ)つ Bye