An average speed of 7.5 mph.
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Approx 16.17 mph.
1760 yards = 5280 ft. or 1 mile.
Since the zebra is running 40 miles in 1 hour, or 40 miles in 60 minutes, the zebra would run 1 mile in 1.5 minutes or in 1 minute and 30 seconds.
Each runner runs five eigths of a mile
In 4.27 minutes he runs 1 mile so in 60 minutes he will run 60*1/4.27 = 14.05 miles (to 2 dp)