Question : A and B can do a certain work in 6 hours, and A, B, and C together take 4 hours to do the same. How long will it take for C alone to accomplish the task?

Option 1: 12 hours

Option 2: 4 hours

Option 3: 2 hours

Option 4: 6 hours

Question : It takes A and B, 3 and 6 hours, respectively, to complete a certain work. If they work on the alternate hour. How long will it take them to accomplish the task?

Option 1: 3 hours

Option 2: 4 hours

Option 3: 2 hours

Option 4: 4.5 hours

Question : A can do a certain task in 1.5 times the number of days in which B and C together can do it. If A and B together can do the task in 30 days, and C alone can do it in 120 days, how many days will B take to do this task alone?

Option 1: 75

Option 2: 45

Option 3: 60

Option 4: 50

Question : Two workers A and B are engaged to do a piece of work. Working alone A would take 8 hours more to complete the work than when working together. If B worked alone, would take $4\frac{1}{2}$ hours more than when working together. The time required to finish the work together is:

Option 1: 5 hours

Option 2: 4 hours

Option 3: 8 hours

Option 4: 6 hours

Question : A and B can complete a task together in 18 hours. After 6 hours, A leaves. B takes 36 hours to finish the rest of the task. How many hours would it have taken A to do the task if he worked alone?

Option 1: 54

Option 2: 45

Option 3: 21

Option 4: 27

Question : Richa, Rita and Reena can independently complete a task in 8 hours, 12 hours and 24 hours, respectively. If they work together, how much time will they take to complete that task?

Option 1: 4 hours

Option 2: 5 hours

Option 3: 2 hours

Option 4: 3 hours