A can do as much work as B and C together can do. A and B ca...

A can do as much work as B and C together can do. A and B can together 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 ?

Course Name: Quantitative Aptitude

1] 18 hours
2] 24 hours
3] 30 hours
4] 12 hours

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1 Discuss	A and B together can complete a task in 20 days. B and C together can complete the same task in 30 days. A and C together can complete the same task in 40 days. What is the respective ratio of the number of days taken by A when completing the same task alone to the number of days taken by C when completing the same task alone? 1] 2:5 2] 2:7 3] 3:7 4] 1:5 Solution
10 Discuss	A, B and C can complete a piece of work in 10, 12 and 15 days respectively. A left the work 5 days before the work was completed and B left 2 days after A had left. Number of days required to complete the whole work was ? 1] 5 days 2] 6 days 3] 8 days 4] 7 days Solution
2 Discuss	If 10 men can do a piece of work in 12 days, the time taken by 12 men to do the same piece of work will be: 1] 12 days 2] 10 days 3] 9 days 4] 8 days Solution
3 Discuss	A, B and C can separately do a work in 12, 15 and 20 days respectively. They started to work together but C left after 2 days. The remaining work will be finished in = ? 1] 4 days 2] 5 days 3] 6 days 4] 15 days Solution
4 Discuss	A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is : 1] $\frac{1}{4}$ 2] $\frac{1}{{10}}$ 3] $\frac{7}{{15}}$ 4] $\frac{8}{{15}}$ Solution
5 Discuss	A group of workers can complete a piece of work in 50 days, when they are working individually. On the first day one person works, on the second day another person joins him, on the third day one person joins them and this process continues till the work is completed. How many approximate days are needed to complete the work ? 1] 8 days 2] 9 days 3] 10 days 4] 11 days Solution
6 Discuss	If the expenditure of gas on burning 6 burners for 6 hours a day for 8 days is Rs. 450, then how many burners can be used for 10 days at 5 hours a day for Rs. 625 ? 1] 12 2] 16 3] 4 4] 8 Solution
7 Discuss	A can complete a piece of work in 18 days, B in 20 days and C in 30 days, B and C together start the work and forced to leave after 2 days. The time taken by A alone to complete the remaining work is: 1] 10 days 2] 12 days 3] 15 days 4] 16 days Solution
8 Discuss	A does half as much work as B in one-sixth of the time. If together they take 10 days to complete a work. How much time shall B alone take to do it ? 1] 30 days 2] 40 days 3] 50 days 4] 70 days Solution
9 Discuss	If A, B and C can complete a piece of work in 6 days. If A can work twice faster than B and thrice faster then C, than the number of days C alone can complete the work is ? 1] 44 days 2] 33 days 3] 22 days 4] 11 days Solution
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