Answer:
Unscented candles : unit rate = 3.538 inches / hour
Step-by-step explanation:
Scented candles :
Burns 310 inches on 15 hours
Unscented candles :
Burns 46, inches in 13 hours
The unit rate of unscented candles :
Total inches burnt / total number of hours
46 inches / 13 hours
= 3.538 inches per hour
For scented candles :
Total inches burnt / total number of hours
310 inches / 15 hours
= 3.538 inches per hour
= 20.667 inches / hour
