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

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 can do $\frac{4}{5}$th of a work in 20 days and B can do $\frac{3}{4}$th of the same work in 15 days. They work together for 10 days. C alone completes the remaining work in 1 day. B and C together can complete $\frac{3}{4}$th of the same work in:

Option 1: 6 days

Option 2: 8 days

Option 3: 5 days

Option 4: 4 days

Question : A can do a certain piece of work in 2.4 times the number of days in which B and C together can do it. If A and B together can do the same piece of work in 27 days and C alone can do it in 75 days, then how many days will B take to do this piece of work alone?

Option 1: 54

Option 2: 48

Option 3: 45

Option 4: 42

Question : John can do a piece of work alone in 20 days, while Ravi can do the same piece of work alone in 28 days. In how many days can the duo complete the same work if they work together?

Option 1: $11 \frac{1}{3}$

Option 2: $12 \frac{2}{3}$

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

Option 4: $12 \frac{1}{3}$