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Working alone, it takes Randy 11 hours to inventory the instrument sho
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28 Feb 2024, 01:52
28 Feb 2024, 01:52
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Question Stats:
90% (01:11) correct
10% (01:16) wrong based on 10 sessions
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Working alone, it takes Randy 11 hours to inventory the instrument shop. Liz can complete the same inventory in 10 hours. If they worked together, how long would it take them to complete the inventory of the instrument shop?
A. 5.24 hours
B. 5.59 hours
C. 5.77 hours
D. 5.6 hours
E. 5 hours
A. 5.24 hours
B. 5.59 hours
C. 5.77 hours
D. 5.6 hours
E. 5 hours
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Free Materials for the GRE General Exam - Where to get it!!
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Re: Working alone, it takes Randy 11 hours to inventory the instrument sho
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28 Feb 2024, 10:30
28 Feb 2024, 10:30
1
rate * time = work
Randy's rate is 1 instrument/11 hours and Liz's rate is 1 instrument/10 hours.
If they are working together, their combined rate is (1/11 + 1/10) instruments per hour.
time = work / rate = 1 / (1/11 + 1/10) = 1 / (21/110) = 110/21 = 5.24 hours
Randy's rate is 1 instrument/11 hours and Liz's rate is 1 instrument/10 hours.
If they are working together, their combined rate is (1/11 + 1/10) instruments per hour.
time = work / rate = 1 / (1/11 + 1/10) = 1 / (21/110) = 110/21 = 5.24 hours
gmatclubot
Re: Working alone, it takes Randy 11 hours to inventory the instrument sho [#permalink]
28 Feb 2024, 10:30
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