21120 ft/4 hours = 4 miles/4 hour = 1 mph
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21120!
0.25
At 60 mph, that's 4 hours.
200 miles / 4 hours = 50 mph
203 in 4 4/5 hours = 203 divided by 24/5 ie multiplied by 5/24 = 1015/24 = 42.29 kph To get from kph to mph multiply by 5/8, giving 26.43 mph