Question : A alone can do a piece of work in 7 days, while B alone can do it in 10 days. In how many days will they complete the same work if they both work together?

Option 1: $\frac{105}{17}$ days

Option 2: $\frac{35}{17}$ days

Option 3: $\frac{70}{17}$ days

Option 4: $\frac{84}{17}$ days

Question : S alone can do a piece of work in 14 days. T alone can do the same work in 21 days. U alone can do the same work in 28 days. Working together, in how many days will they complete the work?

Option 1: $\frac{84}{13}$ days

Option 2: $\frac{77}{13}$ days

Option 3: $\frac{71}{13}$ days

Option 4: $\frac{87}{13}$ days

Question : Riya alone can complete a piece of work in 6 days while Siya alone can do the same work in 9 days. If they both work together, then how many days will be required to finish the work?

Option 1: $\frac{45}{13}$

Option 2: $\frac{18}{5}$

Option 3: $\frac{33}{17}$

Option 4: $\frac{55}{16}$

Question : A alone can complete a work in 16 days and B alone can complete the same work in 96 days. In how many days both A and B together can complete the same work?

Option 1: $\frac{88}{13}$ days

Option 2: $\frac{96}{7}$ days

Option 3: $\frac{96}{13}$ days

Option 4: $\frac{88}{14}$ days

Question : A can do a piece of work alone in 15 days, while B complete the same piece of work alone in 12 days. If they work on it together for 5 days, then the fraction of the work that will be left is:

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

Option 2: $\frac{5}{8}$

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

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

Question : ${\mathrm{N}}_1$ alone can do 20% of a piece of work in 6 days, ${\mathrm{N}}_2$ alone can do 20% of the same work in 4 days, and ${\mathrm{N}}_3$ alone can do 50% of the same work in 12 days. In how many days can they complete the work, if all of them work together?

Option 1: 10 days

Option 2: $\frac{120}{13}$ days

Option 3: 8 days

Option 4: $\frac{120}{17}$ days