Consider a unit load AS/RS rack that is 500 long and 45 high. The S/R machine travels at 400 fpm and 120 fpm in the horizontal and vertical directions, respectively. The I/O point is located at the lower-lefthand corner of the rack. As shown by the shaded area below, the S/R machine will not be allowed to use one-third of the rack during the first shift. Compute the expected dual-command travel time (in minutes) to perform a dual-command trip, assuming that the first operation is in region A and the second operation is in region B. (Each trip starts and ends at the I/O point.)

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45' A 500 P/D 250' 166.666' B