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BEBRAS 2019 Grade 9-10 Round 2 Ext Question 15

BEBRAS · BEBRAS 2019 Grade 9-10 Round 2 Ext

Question 15

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

Question illustration

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.

Question illustration

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?
  1. 13:00
  2. 16:00
  3. 17:00
  4. 18:00