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To keep in shape, Vincent exercises at a track near his home.
He requires 40 minutes to do 4 laps running and 7 laps walking,
In contrast, he requires 18 minutes to do 2 laps running and 3 laps walking,
Assuming he maintains a consistent pace while running and while walking, how long does Vincent take to complete a
at each pace?
Vincent takes
minutes to run a lap and
minutes to walk a lap.