Question : A father can do a job as fast as his two sons working together. If one son does the job in 3 hours and the other in 6 hours, the number of hours taken by the father to do the job alone is:

Option 1: 1 hour

Option 2: 2 hours

Option 3: 3 hours

Option 4: 4 hours

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 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 : A, B, and C can do a job working alone in 6, 9, and 18 days, respectively. They all worked together for one day, and then A and B quit. How many days does C working alone take to complete the remainder of the job?

Option 1: 9

Option 2: 6

Option 3: 12

Option 4: 10

Question : A works 5.4 times as fast as B and A takes 22 days less than B to complete the job when each works alone. Calculate the number of days taken to complete the same job if A and B work together.

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

Option 2: $4 \frac{3}{16}$

Option 3: $4 \frac{7}{32}$

Option 4: $4 \frac{5}{32}$

Question : Amit can complete a piece of work in 5 hours, Jeevan and Paul together can complete it in 4 hours, while Amit and Paul together can complete it in 3 hours. Approximately, how many hours will Jeevan alone take to complete the work (rounded off to the nearest integer)?

Option 1: 5 hours

Option 2: 6 hours

Option 3: 9 hours

Option 4: 8 hours