The average loading time of a scraper is $0\mathrm{.}85$ min. The scraper hauls material over a haul road with rolling resistance $200$ lb$/$ton$.$ The haul route $($from the cut to the fill$)$ is $2,400$ ft at a grade of $2\%.$ To account for acceleration and deceleration, use an average speed of $5$ mph for $200$ feet at each end of the haul and return. The average weight of the load is $72,000$ lbs$.$ Use the scraper specifications for a Cat $631$E $($Table $8\mathrm{.}1)$ and the Performance Charts in Figs. $8\mathrm{.}10$ and $8\mathrm{.}11.$

Q: What is the haul time of the scraper in minutes? Round answer to nearest TWO decimals.

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