Question : A and B together can do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?

Option 1: 60

Option 2: 30

Option 3: 45

Option 4: 40

Question : A and B together can complete a piece of work in 12 days. They worked together for 5 days and then A alone finished the rest of the work in 14 days. A single person can complete the work in:

Option 1: 24 days

Option 2: 22 days

Option 3: 20 days

Option 4: 18 days

Question : If A and B together can do a piece of work in 20 days, and A alone can do the same work in 30 days, in how many days can B alone complete the same work?

Option 1: 45

Option 2: 40

Option 3: 60

Option 4: 50

Question : A can do a piece of work in 20 days and B in 30 days. They work together for 7 days and then both leave the job. Then C alone finishes the remaining work in 10 days. In how many days will C finish the full work?

Option 1: 25 days

Option 2: 30 days

Option 3: 24 days

Option 4: 20 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: $6 \frac{7}{19}$