Answer:
[tex]Sebastian \: ran \: 48 \: miles. [/tex]
Step-by-step explanation:
[tex]let \: Lola \: = l, \\ let \: Mackenzie \: = m, \\ and \\ Sebastian = s \\ l = 6, \: m = 4l, \: and \: s = 2m \: Sebastian \: ran : \\ s = 2(4l) = 2(4 \times 6) = 2 \times 24 = 48. \\ Sebastian \: ran \: 48 \: miles. \\ Mackenzie \: ran \: 24 \: miles \\ Lola \: ran \: 6 \: miles.[/tex]