state gov Bihar NHM CHO 2025 Mock Test Quantitative Aptitude Time and Work Pipe and Cistern

Pipe X can fill a tank in 60 hours while pipe Y can fill the tank in 72 hours. Both pipes are opened together for 20 hours. How much of the tank is left empty?

1
\(\frac{1}{8}\)
2
\(\frac{243}{360}\)
3
\(\frac{7}{18}\)
4
\(\frac{3}{8}\)
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