Katie, elizabeth, and siobhan volunteer at the hospital. in a week, katie volunteers 3 hours more than elizabeth dpes and siobhan volunteers 1 hour less than elizabeth. over 3 weeks, the number of hours katie volunteers is equal to the sum of elizabeth's and siobhan's volunteer hpirs in 3 weeks.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.