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Intermediate Rate Question

Expert replies
by tgonza » Tue Jul 14, 2009 7:17 pm
Can someone please help?

Question: If 6 machines run at the same constant rate, they can complete a job in 8 hours. If only 5 of these machines run at this rate, how many more minutes will be required to complete this same job?

Answers: A)38; B)72; C)80; D)90; E)96
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Source: — Problem Solving |

Re: Intermediate Rate Question

by ssmiles08 » Tue Jul 14, 2009 7:27 pm
tgonza wrote:Can someone please help?

Question: If 6 machines run at the same constant rate, they can complete a job in 8 hours. If only 5 of these machines run at this rate, how many more minutes will be required to complete this same job?

Answers: A)38; B)72; C)80; D)90; E)96
IMO E.

1/[6(1/x)] = 8

x = 48

1/[5(1/48)] = 48/5 hours.

48/5* 60 = 576 min

8*60 = 480 minutes

576 - 480 = 96
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