railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Both tap M and tap N together can fill a tank in 20/3 hours. If tap M opens for only 4 hours and the remaining tank is filled by tap N for only 9 hours. How many hours to fill the tank by tap N?
1
10 hours
2
12.5 hours
3
25 hours
4
10.5 hours