Tonya’s dog-walking service charges a flat rate of $20 per month, plus $3 per mile that each dog is walked. Beth does not charge a monthly fee for her dog-walking service, but she charges $5 per mile that each dog is walked. Select the equation and solution to find the number of miles m for which Tonya and Beth would charge the same amount. Group of answer choices m=2.5 20 + 3m = 5m m = 12 20 + 3m +5m = 0 m = 10 8m = 20