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 do a piece of work in 12 days, while A alone can do the same work in 30 days. B alone can do it in:

Option 1: 18 days

Option 2: 20 days

Option 3: 15 days

Option 4: 22 days

Question : M is three times as good a worker as N and together they finish a piece of work in 30 days. In how many days will M alone finish the work?

Option 1: 50

Option 2: 40

Option 3: 60

Option 4: 45

Question : A can do a piece of work in 10 days and B can do it in 12 days. They work together for 3 days. Then B leaves and A alone continues. 2 days after that C joins and the work is completed in 2 days more. In how many days can C do it, if he works alone?

Option 1: 30 days

Option 2: 50 days

Option 3: 40 days

Option 4: 60 days

Question : A can complete a piece of work alone in 120 days, while A and B, working together, can complete the same work in 72 days. In how many days can B, working alone, complete this piece of work?

Option 1: 180

Option 2: 200

Option 3: 160

Option 4: 216