QUESTION $5\mathrm{.}3$ Earth$$whose in situ weight is $112$ lb$/$cf$,$ whose loose weight is $95$ lb$/$cf$,$ and whose compacted weight is $120$ lb$/$cf$$is placed in a fill at the rate of $250$ cy$/$hr$,$ measured as compacted earth. The thickness of the compacted layers is $6$ in$.$ A compactor with a roller drum width of $84$ in$.$ is used to compact the material at a speed of $2\mathrm{.}5$ mph$.$ Assume a $55-$min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction rate if eight drum passes are specified for each layer of earth.

QUESTION $5\mathrm{.}4$ Estimate the production in ccy per hour for a roller if its average speed will be $4$ mph and it will cover $5\mathrm{.}5$ ft in one pass. The job specifications limit the compacted lift thickness to $5$ in$.$ and require four passes per lift. The company usually figures production based on a $50-$min hour.