60 mph
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That depends on your average rate of speed. At 60 mph, you can cover 420 miles in 7 hours. At 30 mph, it will take 14.
Average speed was 65 mph. 100 miles + 420 miles = 520 miles 2 hours + 6 hours = 8 hours 520/8 = 65 mph
420 Miles.
The average speed is 120 miles per hour.
Oh, dude, let's break out the ol' calculator for this one! So, if you're cruising at a cool 60 miles per hour, it would take you about 7 hours to cover 420 miles. Just enough time to listen to a couple of podcasts and maybe grab a snack... or two.