Question : A alone can do $\frac{2}{5}$ of a work in 12 days. B is 25% more efficient than A. C alone can do the same work in 12 days less than B. D is 25% less efficient than C. If they all work together, then the work will be completed in how many days?

Option 1: $\frac{240}{53}$ days

Option 2: $\frac{180}{43}$ days

Option 3: $\frac{200}{51}$ days

Option 4: $\frac{300}{47}$ days

Question : A is 20% more efficient than B. How much time will they working together take to complete a job which A alone could have done in 29 days?

Option 1: $\frac{145}{11}$ days

Option 2: $\frac{116}{11}$ days

Option 3: $\frac{203}{11}$ days

Option 4: $\frac{174}{11}$ days

Question : Rekha alone can complete a task in 16 days and Bina alone can complete the same task in 12 days. Starting with Rekha, they work on alternate days. The task will be completed in:

Option 1: $12 \frac{3}{4}\ \text{days}$

Option 2: $12\ \text{days}$

Option 3: $13\ \text{days}$

Option 4: $13 \frac{3}{4}\ \text{days}$

Question : If Anju is 30% more efficient than Bittu, then how much time will they take, working together, to complete a job which Anju alone could have done in 23 days?

Option 1: $13$ days

Option 2: $20 \frac{3}{17}$ days

Option 3: $15$ days

Option 4: $11$ days

Question : Anshu, Swati, and Rajni can finish a work in 4 days if they work together. However, Anshu alone will take 9 days to complete the work, and Swati alone will complete the work in 12 days. How many days will Rajni alone take to complete the work?

Option 1: 18

Option 2: 12

Option 3: 24

Option 4: 16