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Contractor has 3cy and 5 cy shovel; excavate 50,000 bcy of hard clay in 30 days...

Contractor has 3cy and 5 cy shovel; excavate 50,000 bcy of hard clay in 30 days of 8 hours each. average height is 9 feet, angle of swing is 70 degrees; 3 cy maximum digging is 20 feet; 5 cy maximum is 30 ft. efficiency factor is 30 min hour. How many days to complete the job?

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