state gov UP Police Head Operator (Radio Cadre) Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
Pipes A and B together can fill an empty tank in x minutes. A alone takes (8 + x) minutes to fill the tank and B alone takes (32 + x) minutes to fill the tank. A and B together fill the tank for 10 minutes. C alone fills the remaining part of the tank in 4\(\frac{1}{2}\) minutes. A, B and C together can fill \(\frac{7}{20}\)th part of the tank in:
1
2\(\frac{2}{5}\) minutes
2
2\(\frac{4}{5}\) minutes
3
3\(\frac{1}{2}\) minutes
4
3\(\frac{1}{4}\) minutes