If you are able to maintain an average of 60 miles per hour (97 kilometers per hour), driving 277 miles (446 km) will require 4.6 hours (about 4 hours and 40 minutes.) If you can only maintain an average of 35 miles per hour (about 56 kilometers per hour), then going 277 miles (446 (km) will take 7.9 hours ( abut 7 hours and 55 minutes)
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