By averaging about 3.1 meter per second.
(Which should not be too difficult, it is a jogging pace)
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She can run 18.75 miles in 15 minutes at that pace. This, however, is humanly impossible since she would have to run at 75 mph!
9 mph for 1 hour and 40 minutes is 15 miles. 1 hour at 9 mph = 9 miles 40 minutes at 9mph = 6 miles 9 miles + 6 miles = 15 miles
8mph
1 7/8
If Jay continues the same pattern of running an extra mile in the extra 5 minutes each day then on Thursday you would expect him to run 4 miles in 20 minutes.