I got it wrong and I don't have time to fix it, I don't know how to delete my response do just report this I guess ;-;
Answer:
15 minutes
Explanation:
distance = rate · time
16 = 20r
r = 16/20 or 4/5 miles per minute
12 = 4/5·t
4t = 12·5
t = 60/4 or 15 minutes
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