1. Find the concentration of lidocaine in mg/ml:
\frac{500 \text{ mg}}{1000 \text{ ml}} = 0.5 \text{ mg/ml}
2. Determine how many mg per hour:
1 \text{ mg/minute} \times 60 \text{ minutes/hour} = 60 \text{ mg/hour}
3. Calculate the infusion rate in ml/hour:
\frac{60 \text{ mg/hour}}{0.5 \text{ mg/ml}} = 120 \text{ ml/hour}
Final answer:
120 \text{ ml/hour}