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 : 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 : A is 40% more efficient than B. How much time will both, working together, take to finish the work, which B alone can finish in 36 days?

Option 1: $18$ days

Option 2: $9\frac{1}{3}$ days

Option 3: $15$ days

Option 4: $11\frac{2}{3}$ days

Question : A is 40% more efficient than B. How much time will they take to work together to complete a job which A alone could have done in 31 days?

Option 1: $\frac{217}{12}\text{days}$

Option 2: $\frac{515}{32}\text{days}$

Option 3: $\frac{215}{12}\text{days}$

Option 4: $\frac{517}{32}\text{days}$

Question : A, B, and C working alone, can complete a job in 16, 24, and 36 days, respectively. In how many days can they complete the job if they work together?

Option 1: $7\frac{11}{19}$

Option 2: $5\frac{17}{19}$

Option 3: $4\frac{13}{19}$

Option 4: $6\frac{7}{19}$

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