13.

Two taps can fill a tank in 30 minutes and 40 minutes. Another tap can empty it in 24 min. If the tank is empty and all the three taps are kept open, in how much time the tank will be filled

Group 4 - 2014

14.

A can do a certain job in 12 days. B is 60% more efficient than A How many days does B alone take to do the same job?

Group 2A - 2016

15.

A and B can do a work in 12 days B and C can do it in 15 days C and A can do it in 20 days. Then the number of days required to complete the work A, B, C together is

Group 1 - 2014

16.

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?

Group 2 - 2013

17.

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

Group 4 - 2013

18.

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?

Group 2 - 2013