If Jason runs 8 miles in an hour and bikes 12 miles in an hour, and he runs a total of 3 hours and bikes a total of 6 hours this week, then he runs a total of 83 = <<83=24>>24 miles this week.
He also bikes a total of 126 = <<126=72>>72 miles this week.
In total, Jason runs and bikes a total of 24+72 = <<24+72=96>>96 miles this week.