A) 10 days
B) 11 days
C) 9 days
D) 12 days
Correct Answer: B
Solution :
[b] (A+B)'s first 2 days work \[=\frac{1}{9}+\frac{1}{15}=\frac{5+3}{45}=\frac{8}{45}\] (A+B)'s 10 days work\[=\frac{8\times 5}{45}=\frac{40}{45}\] Remaining work\[=1-\frac{40}{45}=\frac{1}{9}\] So, the work will be completed by \[10+1=11\]days |
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