Seeking after-school babysitter for three elementary children on Wed and Thurs

I am looking for an after-school babysitter for three elementary school children on Wednesdays and Thursdays. On Wednesdays, I need pick up from school at 3pm, and then to drop them off at an activity at 4:30pm (and be available in case the activity is canceled). On Thursdays, I need pick up from school and then to watch the kids until 6pm. The ideal candidate has experience with multiple children and a safe, dependable car. Children are aged 7, 9 and 11. Thank you!