Question : A and B can do a job in 10 days and 5 days, respectively. They worked together for two days, after which B was replaced by C and the work was finished in the next three days. How long will C alone take to finish 60% of the job?

Option 1: 18 days

Option 2: 30 days

Option 3: 25 days

Option 4: 24 days

Question : A can complete one-third of a work in 10 days and B can do $\frac{3}{5}$ th of the same work in 24 days. They worked together for 10 days. The remaining work was completed by C alone in 15 days. In how many days can C alone do $\frac{2}{3}$rd of the same work?

Option 1: 27

Option 2: 24

Option 3: 30

Option 4: 32

Question : A alone can complete a work in 18 days and B alone in 15 days. B alone worked at it for 10 days and then left the work. In how many more days, will A alone complete the remaining work?

Option 1: $5$ days

Option 2: $5\frac{1}{2}$ days

Option 3: $6$ days

Option 4: $8$ days

Question : A is twice as efficient as B and C is thrice as efficient as B. Working together, they can finish a certain work in 5 days. A and C worked together for 5 days. B alone would complete the remaining work in ____.

Option 1: 8 days

Option 2: 5 days

Option 3: 6 days

Option 4: 4 days

Question : A and B can do a piece of work in 10 days. B and C can do it in 12 days. C and A in 15 days. In how many days will C finish it alone?

Option 1: 24 days

Option 2: 30 days

Option 3: 40 days

Option 4: 60 days