Q1 · hard · AI-verified
A pipe can fill a tank in 6 hours and another pipe can fill it in 8 hours. A third pipe can empty the tank in 12 hours. If all three pipes are opened together, in how many hours will the tank be filled?
- 4 hours
- 4.8 hours
- 5.2 hours
- 6 hours
Q2 · hard · AI-verified
12 men and 18 boys can complete a work in 14 days. 8 men and 16 boys can complete the same work in 20 days. In how many days can 10 men and 12 boys complete the work?
- 16 days
- 18 days
- 20 days
- 24 days
Q3 · hard · AI-verified
A can complete a work in 18 days. B is 50% more efficient than A. C is 25% less efficient than B. If all three work together, in how many days will they complete the work?
- 6 days
- 7 days
- 5 days
- 8 days
Q4 · hard · AI-verified
A and B can do a work in 15 days and 10 days respectively. They start working together but after 3 days B falls sick and his efficiency reduces to half. In how many more days from that point will the work be completed?
- 9 days
- 12 days
- 15 days
- 18 days
Q5 · hard · AI-verified
20 women can complete a work in 16 days working 8 hours per day. How many days will 16 women take to complete the same work working 10 hours per day?
- 16 days
- 18 days
- 20 days
- 24 days