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16 Nov 2015, 03:25
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (00:58) correct
13%
(01:15)
wrong
based on 178
sessions
History
Date
Time
Result
Not Attempted Yet
Carl can wash all the windows of his house in 6 hours. His wife Maggie can wash all the windows in 4 hours. How many hours will it take for both of them working together to wash all the windows?
A. 2
B. 2 1/4
C. 2 2/5
D. 4 1/2
E. 5
A. 2
B. 2 1/4
C. 2 2/5
D. 4 1/2
E. 5
HardWorkBeatsAll
Joined: 17 Aug 2015
Last visit: 19 Jul 2020
Posts: 89
Given Kudos: 341
Location: India
Concentration: Strategy, General Management
Schools: Duke '19 (II)
GMAT 1: 750 Q49 V42
GPA: 4
WE:Information Technology (Finance: Investment Banking)
16 Nov 2015, 03:30
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In 1 hour, Carl can wash 1/6 of the total windows and Maggie can wash 1/4 of the total windows.
So, in 1 hour, they can wash 1/6 + 1/4 = 5/12 of the windows together.
5/12 in 1 hour
1 in X hours
X = 1/(5/12) = 12/5 = 2 2/5
Hence, (C)
So, in 1 hour, they can wash 1/6 + 1/4 = 5/12 of the windows together.
5/12 in 1 hour
1 in X hours
X = 1/(5/12) = 12/5 = 2 2/5
Hence, (C)
