Two candles of equal length are lit at the same time. one candle takes 6 hours to burn out, and the other takes 9 hours to burn out. after how much time will the slower burning candle be exactly twice as long as the faster burning one?

4.5 hours

Step-by-step explanation:

Two candles of equal length. Let h cm be the length of each candle.

1st candle:

It takes 6 hours to burn out, then is the burning rate of the first candle.

2nd candle:

It takes 9 hours to burn out, then is the burning rate of the second candle.

In x hours, the first candle is cm long and the second candle is cm long.

The slower burning candle (the second candle) will be exactly twice as long as the faster burning candle (the first candle) in

b.an increase in a causes b to decrease

7

step-by-step explanation: