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12 Jan 2015, 11:03
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:07) correct
18%
(01:24)
wrong
based on 301
sessions
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Each of the three people individually can complete a certain job in 3, 4, and 5 hours, respectively. What is the lowest fraction of the job that can be done in 1 hour by 2 of the people working together at their respective rates?
(A) 1/3
(B) 9/20
(C) 8/15
(D) 7/12
(E) 2/3
Kudos for a correct solution.
(A) 1/3
(B) 9/20
(C) 8/15
(D) 7/12
(E) 2/3
Kudos for a correct solution.
12 Jan 2015, 11:26
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The question asks us about the lowest fraction of the job done in an hour, so we need to combine the two slower people:
\(\frac{1}{R}=\frac{1}{4}+\frac{1}{5}=\frac{9}{20}\)
Answer B.
\(\frac{1}{R}=\frac{1}{4}+\frac{1}{5}=\frac{9}{20}\)
Answer B.
13 Jan 2015, 04:01
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Answer = (B) 9/20
Lowest fraction means addition of rates of maximum time taken
\(= \frac{1}{4} + \frac{1}{5} = \frac{9}{20}\)
Answer = B
Lowest fraction means addition of rates of maximum time taken
\(= \frac{1}{4} + \frac{1}{5} = \frac{9}{20}\)
Answer = B
