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t takes 7

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Joined: 16 Jun 2018
Posts: 52
t takes 7  [#permalink]

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New post 02 Oct 2018, 02:10
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It takes 7 high school students, working at identical constant individual rates, 10 hours to paint a certain house. At what time will the house be fully painted if 7 students start painting at 9 AM and one student, working at the same rate, is added per hour starting at 1 PM?

A) 03:00 PM
B) 04:00 PM
C) 05:00 PM
D) 05:20 PM
E) 05:55 PM
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Posts: 56244
Re: t takes 7  [#permalink]

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New post 02 Oct 2018, 02:13
suelahmed wrote:
It takes 7 high school students, working at identical constant individual rates, 10 hours to paint a certain house. At what time will the house be fully painted if 7 students start painting at 9 AM and one student, working at the same rate, is added per hour starting at 1 PM?

A) 03:00 PM
B) 04:00 PM
C) 05:00 PM
D) 05:20 PM
E) 05:55 PM


Discussed here: https://gmatclub.com/forum/it-takes-7-h ... 08484.html
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Re: t takes 7   [#permalink] 02 Oct 2018, 02:13
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