Q1 · medium · AI-verified
A worker A is twice as efficient as worker B. Together they complete a work in 12 days. How many days will A alone take to finish the work?
- 20 days
- 24 days
- 16 days
- 18 days
Q2 · medium · AI-verified
A tank has a leak that can empty it in 8 hours. A pipe fills the tank in 6 hours. If both the pipe and the leak are open, how long will it take to fill the tank?
- 12 hours
- 24 hours
- 18 hours
- 20 hours
Q3 · hard · AI-verified
A cistern is normally filled in 8 hours but takes 2 hours longer to fill due to a leak at the bottom. If the cistern is full, in how many hours will the leak empty it?
- 32 hours
- 40 hours
- 20 hours
- 16 hours
Q4 · hard · AI-verified
A and B together can complete a work in 12 days. B and C together in 15 days. A and C together in 20 days. In how many days can A, B and C together complete the work?
- 15 days
- 12 days
- 8 days
- 10 days
Q5 · medium · AI-verified
A pipe fills 1/3 of a tank in 30 minutes. How many minutes will it take to fill the rest of the tank?
- 90 minutes
- 50 minutes
- 45 minutes
- 60 minutes