A track$-$type dozer equipped with a power shift can push an average blade load of $6\mathrm{.}15$ LCY $.$ The material being pushed is silty sand $($loose material$).$ The average push distance is $90$ ft $.$ Assuming the required drawbar pull is $20,000lb,$ the altitude derating factor is $20\%,$ and job efficiency is $45mi\frac{n}{h}r,$ calculate the hourly production of the dozer. $($note: $1m\frac{i}{h}r=88f\frac{t}{m}in$