Assuming you mean: what is the speed if 4000 miles takes 6 hours:
speed = distance/time = 4000 mi / 6 hr = 666 2/3 mph
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324/6 = 54 miles per hour
Average speed was 65 mph. 100 miles + 420 miles = 520 miles 2 hours + 6 hours = 8 hours 520/8 = 65 mph
360 miles in 6 hours is an average speed of 360/6 = 60 miles per hour, no matter where it happened, even if it never left the parking lot.
2 hours
Time = Distance /Speed = 546/60 = 9.1 hours = 9 hours and 6 minutes