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Mid-Western Crops

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DISCUSSION QUESTIONS AND PROBLEMS 527
13-15 The wheat harvesting season in the American Midwest is short, and most farmers deliver their truckloads
of wheat to a giant central storage bin within a two-week span. Because of this, wheat-filled trucks
waiting to unload and return to the fields have been known to back up for a block at the receiving bin.
The central bin is owned cooperatively, and it is to every farmer's benefit to make the unloading/storage
process as efficient as possible. The cost of grain deterioration caused by unloading delays, the cost of
truck rental, and idle driver time are significant concerns to the cooperative members. Although farmers
have difficulty quantifying crop damage, it is easy to assign a waiting and unloading cost for truck and
driver of $18 per hour. The storage bin is open and operated 16 hours per day, 7 days per week, during
the harvest season and is capable of unloading 35 trucks per hour according to an exponential distribution.
Full trucks arrive all day long (during the hours the bin is open) at a rate of about 30 per hour, following
a Poisson pattern.
To help the cooperative get a handle on the problem of lost time while trucks are waiting in line
or unloading at the bin, find the
(a) average number of trucks in the unloading system.
(b) average time per truck in the system.
(c) utilization rate for the bin area.
(d) probability that there are more than three trucks
in the system at any given time.
(e) total daily cost to the farmers of having their
trucks tied up in the unloading process.
The cooperative, as mentioned, uses the storage bin only two weeks per year. Farmers estimate that enlarging
the bin would cut unloading costs by 50% next year. It will cost $9,000 to do so during the off season.
Would it be worth the cooperative's while to enlarge the storage area?

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The solution discusses mid-western crops.

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