Question : A and B together can complete a work in 20 days. B and C together can complete the same work in 15 days. If A, B, and C all work together, then the same work gets completed in 10 days. How many days will A and C together take to complete the same work?

Option 1: 8 days

Option 2: 10 days

Option 3: 15 days

Option 4: 12 days

Question : Disha takes 12 hours to copy a 75-page manuscript, while Mohit can copy the same manuscript in 10 hours. How many hours will it take for them to copy a 150-page manuscript if they work together?

Option 1: $10 \frac{10}{11}$ hours

Option 2: $9 \frac{9}{11}$ hours

Option 3: $8 \frac{9}{11}$ hours

Option 4: $11 \frac{8}{11}$ hours

Question : A can do $\frac{7}{8}$ of work in 28 days, and B can do $\frac{5}{6}$ of the same work in 20 days. The number of days they will take to complete if they do it together is:

Option 1: $15\frac{3}{7}$ days

Option 2: $17\frac{3}{5}$ days

Option 3: $14\frac{5}{7}$ days

Option 4: $13\frac{5}{7}$ days

Question : A can finish a work in 7 days. B can finish the same work in 9 days. The number of days required to finish the same work by both of them together is:

Option 1: $1\frac{15}{16}$

Option 2: $2\frac{15}{16}$

Option 3: $3\frac{15}{16}$

Option 4: $4\frac{15}{16}$

Question : Rahul alone can complete a work in 10 days and Sonu alone can complete the same work in 15 days. If they work together for 4 days, then what part of total work is left?

Option 1: $\frac{2}{3}$

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

Option 3: $\frac{1}{3}$

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