Class VIII

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:
  1. 1 day 24
  2. 7 day 24
  3. 3 3 days 7
  4. 4 days
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?
  1. 7 hours 30 minutes
  2. 8 hours
  3. 8 hours 15 minutes
  4. 8 hours 25 minutes
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?
  1. 11 days
  2. 13 days
  3. 20 3 days 17
  4. None of these
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. 1 4
  2. 1 10
  3. 7 15
  4. 8 15
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?
  1. 6 days
  2. 10 days
  3. 15 days
  4. 20 days
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