A simplified paper drilling cycle has depth 42 mm and equal pecks of 6 mm. Depth is exactly divisible by peck. After each peck except the last, the tool retracts 4 mm and returns the same distance, both at rapid speed 600 mm/min. Cutting feed is 72 mm/min. There are 7 holes. Ignore initial approach, final retract and dwell; count only the movements specified.
Calculate the intermediate rapid time per hole in minutes. Keep intermediate values unrounded; round the final answer to 4 decimal places if needed.
