state gov WBPSC Miscellaneous Services Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes can fill a cistern separately in 36 minutes and 45 minutes, respectively. A waste pipe can drain off 40 litres per minute. If all the three pipes are opened, the cistern fills in one hour. The capacity (in litres of the cistern) is:
1
600
2
1200
3
300
4
400