Question : A and B working together can do a piece of work in $4\frac{1}{2}$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $2\frac{1}{4}$ hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work.

Option 1: 3 hours

Option 2: 2 hours

Option 3: 2.5 hours

Option 4: 3.25 hours

Question : To do a certain work, B would take time thrice as long as A and C together and C twice as long as A and B together. The three men together complete the work in 10 days. The time taken by A to complete the work separately is:

Option 1: 22 days

Option 2: 24 days

Option 3: 30 days

Option 4: 20 days

Question : Reena, Veena, and Vimla can do a work in 4 hours, 8 hours, and 12 hours, respectively. In how much time will they finish the work working together?

Option 1: $\frac{2}{11}$ hours

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

Option 3: $3\frac{2}{11}$ hours

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

Question : A is twice as efficient as B and C is thrice as efficient as B. Working together, they can finish a certain work in 5 days. A and C worked together for 5 days. B alone would complete the remaining work in ____.

Option 1: 8 days

Option 2: 5 days

Option 3: 6 days

Option 4: 4 days

Question : A can do as much work as B and C together can do, A and B can do a piece of work in 9 hours 36 minutes and C can do it in 48 hours. The time (in hours) that B needs to do the work alone, is:

Option 1: 18 hours

Option 2: 24 hours

Option 3: 30 hours

Option 4: 12 hours