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Machine A produces pencils at a constant rate of 9000

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Manager
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Joined: 31 Jul 2006
Posts: 233

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Machine A produces pencils at a constant rate of 9000 [#permalink]

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New post 12 Oct 2008, 22:10
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Machine A produces pencils at a constant rate of 9000 pencils per hour, and machine B produces pencils
at a constant rate of 7000 pencils per hour. If the two machines together must produce 100,000 pencils and if each machine
can operate for at most 8 hours, what is the least amount of time, in hours, that machine B must operate?
a. 4
b.4 and 2/3
c.5 and 1/3
d. 6
e. 6 and 1/4

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Location: Vienna, Austria
Re: Pencils [#permalink]

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New post 13 Oct 2008, 01:29
Total target = 100, 000

Since machine A is faster, and max is 8 hours, we shall allow machine A to orun for 8 hours. It shall thus produce 9000 * 8 = 72, 000 pencils.

We are short by 28, 000, machine B can work for 28K/7K = 4 hours to do it.

A

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Re: Pencils   [#permalink] 13 Oct 2008, 01:29
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Machine A produces pencils at a constant rate of 9000

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