Posted by alejandro on Monday, February 18, 2013 at 2:03pm.
The speed difference is 2 mph
The time it takes to run an extra 1/4 mile is thus 1/8 hour
check:
In 1/8 hour M runs 14/8 = 7/4 mi
J runs 16/8 = 2 mi, or one extra lap
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