A project to move packed earth requires you to decide whether to use a dozer/scraper operation or excavator/truck operation. Determine the most economical operation based on the dozer/scraper operation estimated at $1.25/cy. All equipment carries a rated heaped capacity, has a fill factor of 100%, and works 45-min hours. Excavator costs $95/hr （including operator), cycle time is 0.28 min, and bucket heaped capacity is 5.0 cy. Truck costs $150/hr.(including operator), dump time is 0.5 min （maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are available for the project.Hauling equipment operates in one direction from A to B to C and finally to D. Section Load Length (ft) Speed (mph) A full 3000 9 B full 2500 17 C empty 3000 36 D empty 3000 16
A project to move packed earth requires you to decide whether to use
a dozer/scraper operation or excavator/truck operation. Determine
the most economical operation based on the dozer/scraper operation
estimated at $1.25/cy. All equipment carries a rated heaped capacity, has
a fill factor of 100%, and works 45-min hours. Excavator costs $95/hr
（including operator), cycle time is 0.28 min, and bucket heaped capacity
is 5.0 cy. Truck costs $150/hr.(including operator), dump time is 0.5 min
（maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks are
available for the project.Hauling equipment operates in one direction
from A to B to C and finally to D.
Section Load Length (ft) Speed (mph)
A full 3000 9
B full 2500 17
C empty 3000 36
D empty 3000 16
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