[Quiz] Aptitude: Time and Work

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1. [TNPSC]A man can do a poece of work in 5 days, but with his son he can do it in 3 days. In what time can the son do it alone
   
   1.  6  1/2 days
   2.  7  1/2 days
   3.  7 days
   4.  8 days
   
   
2. [TNPSC]A, B and C together can finish a piece of work in 4 days. A alone can do in 12 days and B alone in 18 days. How many days will be taken by C to do it alone?
   
   1.  10 days
   2.  12 days
   3.  9 days
   4.  18 days
   
   
3.  [TNPSC]A and B can do a piece of work in 10 days; B and C in 15 days; C and A in 18 days. In how many days can B alone do it?
   
   1.  18 days
   2.  12 days
   3.  20 days
   4.  30 days
   
   
4. [TNPSC]A, B, C, D start at the same time to run around a circular garden in the same direction. A completes a round in 30 minutes, B in 60 minutes C in 90 minutes and D in 105 minutes. After what time will they meet again at the starting point?
   
   1.  15 hours
   2.  21 hours
   3.  20 hours
   4.  10 hours
   
   
5. [TNPSC] A can do a work in 12 days; B in 6 days and C in 3 days. A and B start working together and after a day; C joins them. The total number of days required to complete the work is
   
   1.  1  2/7 days
   2.  2  2/7 days
   3.  2  1/7 days
   4.  1  1/7 days

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