A) 7.5
B) 5.4
C) 3.6
D) 3
Correct Answer: C
Solution :
According to question, A can finish the whole work in 6 days \[\therefore \] A's one day's work \[=\frac{1}{6}\] Similarly, 5's one day's work \[=\frac{1}{9}\](A + B)'s one day's work \[=\left( \frac{1}{6}+\frac{1}{9} \right)=\left( \frac{3+2}{18} \right)=\frac{5}{18}\] Therefore, (A + B)'s can finish the whole work in\[=\frac{18}{5}\]day i.e., 3.6 days
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