A burning candle is 22 1/2 cm high at 6am and 17 1/2 high at 7:30am. What will be the height at 9:am at the same rate of burning ?

Answer 1

The candle burns 5 cm in 1.5 hours (from 6am to 7:30am).

So, the candle burns 5 cm in 1.5 hours = 5/1.5 = 3.33 cm per hour.

Therefore, at 9am (which is 2.5 hours after 6am), the candle would have burned 3.33 cm x 2.5 hours = 8.325 cm.

Subtracting this from the original height of 22 1/2 cm at 6am, we get:
22.5 cm - 8.325 cm = 14.175 cm.

Therefore, the height of the candle at 9am would be 14.175 cm.