1 a hydraulic front shovel excavator excavates 40 000 cy of common ear

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1. A hydraulic front shovel excavator excavates 40,000 CY of common earth with a bucket fill factor of
0.9. The heaped bucket capacity is 1.5 CY. The cycle time of the shovel is 21 seconds. The percentages
of swell and shrinkage of the soil are 25% and 20%, respectively. Job efficiency is equivalent to a 50-
min per hour. The excavator's maximum height of the cut is 25 ft, and the average height of the cut is
9 ft. The average swing angle is 90°. Estimate the working days required to complete the excavating
work. (14 pts) (Note: 1 day 8 hours)