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Time and work 2

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Question 1

A can do a work in 20 days and B can do the same work in 30 days. In how many days can A and B together do the work ?

Question 2

A can do a work in 20 days and B in 40 days. If they work on it together for 5 days, then the fraction of the work left is?

Question 3

If 80 persons can finish a work within 16 days by working 6 hours a day, the number of hours a day, should 64 persons work to finish the same job within 15 days is:

Question 4

A and B can do a piece of work in 72 days, B and C can do it in 120 days, and A and C can do it in 90 days. When A, B and C work together, how much work is finished by them in 3 days.

Question 5

A is twice as good a workman as B and together they finish a piece of work in 14 days. The number of days taken by A alone to finish the work is

Question 6

Working 8 hours a day, Anu can copy a book in 18 days. How many hours a day should she work so as to finish the work in 12 days?

Question 7

A stock of food grain lasts for 21 days for village A. The same stock would last for 28 days for village B. If the food grains given to one village are used for both the villages together, the stock would last for

Question 8

A and B can do a piece of work in 10 days. B and C can do it in 12 days. A and C can do it in 15 days. How long will A take to do it alone?

Question 9

A does half as much work as B in one-third of the time taken by B. If together they take 10 days to complete a work, then the time taken by B alone to do it would have been

Question 10

If th of a cistern is filled in 1 minute, the time to fill the rest is
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