Q1 · 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)
Q2 · medium · PYQ 2024
A pipe can fill the tank in 12 hours. Due to a leak, both pipes can fill the tank in 18 hours. In how many hours will the leak empty the full tank?
- 36
- 24
- 30
- 48
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 · hard · AI-verified
Three pipes X, Y, and Z can fill a tank in 30, 40, and 60 hours respectively. All three are opened together. After 5 hours, X is closed. After another 5 hours, Y is also closed. How long will Z take to fill the remaining tank?
- 35 hours
- 20 hours
- 30 hours
- 25 hours
Q5 · medium · PYQ 2024
A pipe can fill an empty tank in 5 minutes and another pipe can empty it in 6 minutes. If both pipes are opened simultaneously how long will it take both pipes to fill the tank?
- 25 min
- 35 min
- 30 min
- 33 min