Question : A and B can do a piece of work in 45 and 40 days, respectively. They began the work together, but A left after some days and B finished the remaining work in 23 days. A left after:

Option 1: 6 days

Option 2: 9 days

Option 3: 12 days

Option 4: 5 days

Question : Ravi can do a piece of work in 40 days and Sudha can do the same piece of work in 60 days. If they work on alternative days, starting with Sudha on the first day, then in how many days will the work be completed?

Option 1: 40

Option 2: 60

Option 3: 48

Option 4: 45

Question : A and B together can do a piece of work in 36 days and B and C together can do it in 24 days. A and C together can do it in 18 days. The three working together can finish the work in:

Option 1: 8 days

Option 2: 16 days

Option 3: 30 days

Option 4: 32 days

Question : A and B together can complete a piece of work in 12 days. They worked together for 5 days and then A alone finished the rest of the work in 14 days. A single person can complete the work in:

Option 1: 24 days

Option 2: 22 days

Option 3: 20 days

Option 4: 18 days

Question : A can do a piece of work in 6 days, working 8 hours a day, while B can do the same work in 4 days, working 10 hours a day. If the work has to be completed in 5 days, how many hours do they need to work together in a day?

Option 1: $4$

Option 2: $5\frac{4}{11}$

Option 3: $6\frac{4}{11}$

Option 4: $4\frac{4}{11}$