state gov WBPSC Clerkship Mock Test 2023 - 24 Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes can seperately fill a tank in 9 hours and 12 hours respectively. If both pipes are in operation, the tank will be filled in 

1
\(5 \frac{1}{7}\) hours
2
​\(5 \frac{2}{7}\) hours
3
\(5 \frac{3}{7}\) hours
4
5 hours
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