When working out on the track, Sean normally averages x laps per minute, while Jill averages y laps
per minute. During one workout, Sean and Jill ran simultaneously for 40 minutes and completed a
combined total of 53 laps. During a second workout in which they ran a continuous relay, Sean ran for 30 minutes, Jill ran for 28 minutes, and they completed 38.5 laps. Find the values of x and y.