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01 Jul 2019, 02:14
Kudos
Bookmarks
B
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:
89% (00:46) correct
11%
(01:27)
wrong
based on 62
sessions
History
Date
Time
Result
Not Attempted Yet
Tarik can complete a job in 12 minutes. If Andy helps Tarik, they can complete the job in 4 minutes. How long would it take for Andy to complete the job on his own?
A. 5 minutes
B. 6 minutes
C. 7 minutes
D. 8 minutes
E. 9 minutes
A. 5 minutes
B. 6 minutes
C. 7 minutes
D. 8 minutes
E. 9 minutes
01 Jul 2019, 02:18
Kudos
Bookmarks
Bunuel
Let us assume Andy takes x hr on his own to complete the job
\(\frac{1}{12} + \frac{1}{x} = \frac{1}{4}\)
Gives x = 6
IMO B
01 Jul 2019, 02:20
Kudos
Bookmarks
Bunuel
Assume total work = 12 units
Rate of Tarik, \(R_T\) = 12/12 = 1 unit per minute
Both can build in 4 minutes
--> \(R_A\) + \(R_T\) = 12/4 = 3 units per minute
--> \(R_A\) = 2 units per minute
Time taken for Andy alone = 12/2 = 6 minutes
IMO Option B
Pls Hit kudos if you like the solution
