Rudy and Teresa are members of the Austin Rockets Bike Club.
On Saturday, Teresa led a 26.6 mile ride, and Rudy served as the
"sweep." (A sweep is a rider who rides behind the slowest riders and
is responsible for ensuring that there is help for any
rider who has
bike or physical trouble during the ride.) Teresa's group, which had
18 riders in it, finished the ride with an average of about 16 miles
per
hour. Rudy finished with the three slowest riders, and they
averaged about 12.5 miles
per hour. Both groups started the ride at
9:30 a.m. At what time did each of the groups finish? Give times in
hours:minutes:seconds. Example: 9:42:18 a.m.