It was 86.6... (repeating) km per hour.
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441/7 = 63 mph
Average speed was 65 mph. 100 miles + 420 miles = 520 miles 2 hours + 6 hours = 8 hours 520/8 = 65 mph
Your average speed was 59.3 miles per hour.
An average speed of 40 miles per hour.
Distance = Speed x Time Distance = 68km/h x 4 hours Distance = 272 km