Three pipes A,B and C attached to a cistern. A can fill it i...

Three pipes A,B and C attached to a cistern. A can fill it in 10 min, B in 15 min, C is a waste pipe for emptying it. After opening both the pipes A and B, a man leaves the cistern and returns when the cistern should have been just full. Finding, however, that the waste pipe had left open, he closes it and the cistern now gets filled in 2 min. In how much time the pipe C, if opened alone, empty the full cistern?

Course Name: Quantitative Aptitude

1] 12 min
2] 16 min
3] 18 min
4] 15 min
5] None of these

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10 Discuss	3 men or 5 women can do a work in 12 days. How long will 6 men and 5 women take to finish the work ? 1] 20 days 2] 10 days 3] 4 days 4] 15 days Solution
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4 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
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6 Discuss	A can do a piece of work in 12 days and B in 20 days. If they together work on it for 5 days, and remaining work is completed by C in 3 days, then in how many days can C do the same work alone ? 1] 10 days 2] 9 days 3] 12 days 4] 15 days Solution
7 Discuss	A and B can do a job in 7 days. A is ${ \text{1}}\frac{3}{4}$ times as efficient as B. The same job can be done by A alone in? 1] $9\frac{1}{3}{ \text{days}}$ 2] 11 days 3] $12\frac{1}{4}{ \text{days}}$ 4] $16\frac{1}{3}{ \text{days}}$ Solution
8 Discuss	A and B together can complete a job in 8 days. Both B and C, working alone can finish the same job in 12 days, A and B commence work on the job, and work for 4 days, where upon A leaves, B continues for 2 more days, and then he leaves too, C now starts working, and finishes the job. How many days will C require to finish the remaining work ? 1] 5 days 2] 8 days 3] 3 days 4] 4 days Solution
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