Does anyone understand ripping of rock?

An earthmoving contractor encounters a trap-rock formation at shallow depth in a cut. Seismographic tests indicate a seismic velocity of 6,500 fps for the material. On this basis, it is proposed to rip the rock with a 370-hp crawler tractor. Estimate the production in bcy, for full-time ripping, with efficiency based on a 45-min hour. Assume that the ripper is equipped with a single shank and that ripping conditions are average (i.e., intermediate between extreme conditions). The normal O&O cost per hour, including operator, for a 370-hp tractor with ripper is $95.82. This is classified as heavy ripping. Using your estimate of hourly production, estimate the ripping unit-production cost in dollars per bcy without operator.

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