Q1 · medium · PYQ 2025
Three pipes, A, B, and C are capable of filling a tank in 6, 8 and 12 hours, respectively. When all three pipes are opened together, they operate for 2 hours before pipe C is closed. How much additional time will it take to completely fill the tank after that?
- 9/2 hours
- 6/7 hours
- 2/6 hours
- 3/5 hours
Q2 · medium · PYQ 2015
A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x)
- y − x
- xy/(x − y)
- x − y
- xy/(y − x)
Q3 · medium · PYQ 2024
Pipes P, Q, and R can fill a tank with capacities in ratio 40:80:120 (total capacity 240). P fills the tank in 30 minutes. After P works for 30 minutes, Q and R together fill the remaining capacity. For how many more minutes should Q and R be turned on?
- 15 minutes
- 12 minutes
- 10 minutes
- 8 minutes
Q4 · medium · PYQ 2015
Two taps can empty a tank, first tap alone can empty it in 30 minutes and second tap alone in 45 minutes. Both taps together will empty the tank in how many minutes?
- 18 minutes
- 20 minutes
- 16 minutes
- 15 minutes
Q5 · medium · PYQ 2024
Two pipes can fill a tank in 12 hours and 18 hours, respectively, while a third pipe can empty it in 8 hours. How long (in hours) will it take to fill the empty tank if all three pipes are opened simultaneously?
- 72
- 24
- 36
- 48