1 hour and 30 minutes.
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You would have to maintain an average speed of 5.71 mphfor the whole four-mile distance.
It will have travelled 4*60 = 240 miles
Calculation of speed requires distance as well as time. No information on distance given.
At 60 miles per hour, it's one hour and four minutes.
Every animal that can run over four miles an hour top speed can also run four miles an hour.