Question 15
Captain Beaverlian helps according to the priority table: children first, trees second, other work third.

If a new request has lower priority, he continues the current job and postpones the new one. If it has higher priority, he interrupts the current job, completes the new job and then resumes. Equal-priority jobs alternate one hour at a time. The four requests are shown.

Yellow at 9:00: prune trees for 4 hours. Red at 11:00: babysit for 3 hours. Brown at 13:00: dig a tunnel for 1 hour. Green at 15:00: babysit for 1 hour. At what time does Yellow’s request finish?

If a new request has lower priority, he continues the current job and postpones the new one. If it has higher priority, he interrupts the current job, completes the new job and then resumes. Equal-priority jobs alternate one hour at a time. The four requests are shown.

Yellow at 9:00: prune trees for 4 hours. Red at 11:00: babysit for 3 hours. Brown at 13:00: dig a tunnel for 1 hour. Green at 15:00: babysit for 1 hour. At what time does Yellow’s request finish?