Twenty miles (32 km) of gravel road require reshaping and leveling.You estimate that a motor grader will
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Twenty miles (32 km) of gravel road require reshaping and leveling.You estimate that a motor grader will require two passes at 3 mph (4.8 km/h), two passes at 4 mph
(6.4 km/h), and two pass at 5.5 mph (8.9 km/h) to accomplish the work. How many grader hours will be required for this work if the job efficiency factor is 0.75?
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