A) 3 days
B) 4 days
C) 2.5 days
D) 3.6 days
Correct Answer: A
Solution :
A alone can complete the work in 42 days working 1 h daily. Similary, B will taken 56 days working 1 h daily. A's 1 day's work \[=\frac{1}{42}\] B's 1 day's work \[=\frac{1}{56}\] (A + B)?s 1 day's work \[=\frac{1}{42}+\frac{1}{56}=\frac{4+3}{168}=\frac{7}{168}\] \[\therefore \] Time taken by (A + B) working 8 h daily \[=\frac{168}{7\times 8}=3\,\text{days}\]
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