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Working alone at its constant rate, machine A takes 3 hours to produce a batch of identical computer parts. Working alone at its
Working alone at its constant rate, machine A takes 3 hours to produce a batch of identical computer parts. Working alone at its
admin
2018-12-14
145
问题
Working alone at its constant rate, machine A takes 3 hours to produce a batch of identical computer parts. Working alone at its constant rate, machine B takes 2 hours to produce an identical batch of parts. How long will it take the two machines, working simultaneously at their respective constant rates, to produce an identical batch of parts?
选项
答案
6/5 hours, or 1 hour 12 minutes
解析
Since machine A takes 3 hours to produce a batch, machine A can produce 1/3 of the batch in 1 hour. Similarly, machine B can produce - of the batch in 1 hour. If we let x represent the number of hours it takes both machines, working simultaneously, to produce the batch, then the two machines will produce - of the job in 1 hour. When the two machines work together, adding their individual production rates, 1/3 and 1/2, gives their combined production rate 1/x. Therefore,
Thus, working together, the machines will take 6/5 hours, or 1 hour 12 minutes, to produce a batch of parts.
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