Question : A is twice as good a workman as B, and together they finish a piece of work in 13 days. In how many days will A alone finish the work?

Option 1: $41$

Option 2: $39$

Option 3: $19 \frac{1}{2}$

Option 4: $9 \frac{1}{4}$

Question : P and Q can do a piece of work in 14 days. Q and R together can do it in 21 days. If P is twice as good a workman as R, then in how many days Q alone can do the work?

Option 1: 42 days

Option 2: 40 days

Option 3: 35 days

Option 4: 38 days

Question : A is twice as good a workman as B and B is twice as good a workman as C. If A and B can together finish a piece of work in 4 days, then C can do it by himself in:

Option 1: 6 days

Option 2: 8 days

Option 3: 24 days

Option 4: 12 days

Question : A is twice as efficient as B and C is thrice as efficient as B. Working together, they can finish a certain work in 5 days. A and C worked together for 5 days. B alone would complete the remaining work in ____.

Option 1: 8 days

Option 2: 5 days

Option 3: 6 days

Option 4: 4 days

Question : One man and one woman together can complete a piece of work in 8 days. A man alone can complete the work in 10 days. In how many days can one woman alone complete the work?

Option 1: $\frac{140}{9}$ days

Option 2: $30$ days

Option 3: $40$ days

Option 4: $42$ days