18/55 = 0.327 (to 3 decimal places).
The answer is therefore 0.327 hours (to 3 decimal places).
(We must assume you meant to write 55mph in your question and I will amend it so).
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4 minutes 22 seconds.
52.8 seconds to travel 4,260 feet @55mph
If you are driving 700 miles at a constant 55 mph, it will take 12.72 hours. To figure out the time it takes to travel, you divide the distance into the speed.
1.81 hrs
1,243.6 seconds to cover 19 miles at 55mph