Question : Working for 10 hours per day, 6 men can build a wall in a certain number of days. By working for how many hours/per day can 12 men build the wall on the same day?

Option 1: 7 hours 30 minutes

Option 2: 5 hours

Option 3: 20 hours

Option 4: 10 hours

Question : 15 men take 20 days to complete a job, working 8 hours a day. The number of hours a day that 20 men should take to complete the job in 12 days.

Option 1: 5 hours

Option 2: 10 hours

Option 3: 15 hours

Option 4: 18 hours

Question : Working 5 hours a day, A can complete a task in 8 days, and working 6 hours a day, B can finish the same task in 10 days. Working 8 hours daily, they can jointly complete the task in _____.

Option 1: 5 days

Option 2: 3 days

Option 3: 4.5 days

Option 4: 6 days

Question : If 90 men can do a certain job in 16 days, working 12 hours per day, then the part of that work which can be completed by 70 men in 24 days, working 8 hours per day is:

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

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

Option 3: $\frac{7}{9}$

Option 4: $\frac{5}{8}$

Question : A can do a piece of work in 6 days, working 8 hours a day, while B can do the same work in 4 days, working 10 hours a day. If the work has to be completed in 5 days, how many hours do they need to work together in a day?

Option 1: $4$

Option 2: $5\frac{4}{11}$

Option 3: $6\frac{4}{11}$

Option 4: $4\frac{4}{11}$

Question : Two men and 7 women can complete a work in 28 days, whereas 6 men and 16 women can do the same work in 11 days. In how many days will 5 men and 4 women, working together, complete the same work?

Option 1: 20

Option 2: 18

Option 3: 14

Option 4: 22