Question : Amar can complete a work in 15 days and Prem in 12 days. Starting with Amar, they work on alternate days. In how many days will the work be completed?

Option 1: $13\frac{2}{5}$

Option 2: $12\frac{1}{6}$

Option 3: $13\frac{1}{2}$

Option 4: $13$

Question : P, Q, and R can finish a work in 5 days, 10 days, and 15 days, respectively, working alone. P and Q work on the first day, P and R work on the second day, P and Q work on the third day and so on till the work is completed. In how many days the work will be completed?

Option 1: $\frac{13}{2}$

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

Option 3: $\frac{7}{2}$

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

Question : A can do a task in 8 days, while B can do it in 18 days. In how many days will the work be completed if they both work on alternate days, starting with B?

Option 1: $11 \frac{1}{3}$ days

Option 2: $12 \frac{1}{3}$ days

Option 3: $10$ days

Option 4: $10 \frac{1}{3}$ days

Question : A can complete a task in 25 days while B can complete the same task in 30 days. They work on alternate days, starting with A. Both A and B follow this pattern for 5 days and then, A leaves. In how many days will B finish the remaining work?

Option 1: $24 \frac{2}{5}$

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

Option 3: $5 \frac{3}{5}$

Option 4: $24 \frac{3}{5}$

Question : Raju, Shobh, and Mohan can do a work in 15 days, 20 days and 25 days respectively. In how many days, will the work be finished, if they do it on alternate days, starting from Raju?

Option 1: $15 \frac{9}{10}$ days

Option 2: $18 \frac{7}{10}$ days

Option 3: $21 \frac{7}{10}$ days

Option 4: $18 \frac{9}{10}$ days