Bunuel wrote:
A, working alone, can complete a job in 12 hours and B, working alone, can complete the job in 18 hours. If A and B work on the job in alternate hours starting with A, in how much time will the job be done?
A. 13
B. 13 hours and 20 minutes
C. 14 hours
D. 14 hours and 20 minutes
E. 15hours
Are You Up For the Challenge: 700 LevelQuestions
if A starts working first, then A will work 7 hours and B will work 6 hours: (13 hours)
[m] 1-7(\frac{1}{12} ) -6(\frac{1}{18} )=\frac{ 36- 21- 12}{36} =\frac{3}{36} =
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