For a third day, jack and jill are exercising in the50.0-m-long olympic-size swimming pool. on this day, jack swims seven lengths of the pool in 6 minutes and 11.3 seconds. in the same time interval, jill, who is a faster swimmer, covers eight lengths of the pool back and forth in the same time interval. on this day, what is jill's average velocity in meters/second?
