1. **State the problem:** Lily completed the jigsaw puzzle 15 minutes faster than Coby, who took 1 hour 6 minutes. We need to find how long Lily took. 2. **Convert Coby's time to minutes:** $$1\ \text{hour} = 60\ \text{minutes}$$ $$1\ \text{hour} 6\ \text{minutes} = 60 + 6 = 66\ \text{minutes}$$ 3. **Subtract 15 minutes from Coby's time to find Lily's time:** $$66 - 15 = 51\ \text{minutes}$$ 4. **Convert Lily's time back to hours and minutes:** $$51\ \text{minutes} = 0\ \text{hours} \ 51\ \text{minutes}$$ 5. **Final answer:** Lily took **51 minutes** to complete the jigsaw puzzle.