Elaina ran on a treadmill for 30 minutes during her workout today. She programmed the machine so that she would be running 1 mile every 12 minutes. Which equation and solution can be used to describe the number of miles, m, she had run by the end of her 30-minute workout on the treadmill?
a: 12m = 30, m = 2.5
b: 30m = 12, m = 0.4
c: 12 • 1/2 = m, m = 6
d: 1/2 ÷ 12 = m, m ≈ 0.04
