LOADING AND HAULING PART $2$E$.$ CALCULATIVE QUESTIONHow long will a crawler tractor need to excavate $1000$ BCM of common earth and push ita distance of $42$m$.$ The rated blade capacity is $11$ LCM. The reverse speeds are $4\mathrm{.}8$ km$/$h$,$second range $7$ km$/$h and third range $12\mathrm{.}8$ km$/$h$.$ Both management and job conditions areexcellent.A: $2\mathrm{.}09$ hours