Q1 · easy · AI-verified
If 5 workers can build a wall in 20 days, how many days will 10 workers take to build the same wall?
- 40 days
- 15 days
- 10 days
- 8 days
Q2 · hard · AI-verified
A cistern is normally filled in 8 hours but takes 2 hours longer due to a leak in its bottom. If the cistern is full, how long will the leak take to empty it?
- 36 hours
- 32 hours
- 48 hours
- 40 hours
Q3 · medium · AI-verified
Two pipes can fill a tank in 20 minutes and 30 minutes respectively. An outlet pipe can empty the tank in 15 minutes. If all three pipes are opened simultaneously, how long will it take to fill the tank?
- 60 minutes
- 45 minutes
- 120 minutes
- 30 minutes
Q4 · hard · AI-verified
A tank has an inlet pipe that fills it in 8 hours and an outlet pipe that empties it in 12 hours. The tank is currently half full. Both pipes are opened simultaneously. When will the tank be completely full?
- 8 hours
- 12 hours
- 10 hours
- 6 hours
Q5 · easy · AI-verified
Two workers A and B can complete a work in 10 days and 15 days respectively. In how many days will they complete the work together?
- 6 days
- 5 days
- 8 days
- 12 days