Since you already have the distance = 12 miles and rate = 55mph, you can us the equation : distance equals rate x time.
d=rt
12=55t, plug in numbers
12/55=t, divide by 55 on both sides
t=.218 hour or around 13 minutes.
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10 minutes.
90 seconds
55.38 seconds.
109.09 mph
1 minute 51.7 seconds