16. |
X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last? |
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17. |
Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages? |
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18. |
A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days? |
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19. |
A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in: |
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20. |
Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is: |
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