A) 10 hours
B) 12 hours
C) 8 hours
D) none of these
Correct Answer: B
Solution :
[b] Let the required number of working hours/day = x \[\left. \begin{matrix} Pumps & 4:3 \\ Days & 1:2 \\ \end{matrix} \right\}::8:x\] \[\therefore \] \[4\times 1\times x=3\times 2\times 8\] \[\Rightarrow \] \[x=\frac{3\times 2\times 8}{4}=12\]
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