P. A can complete a piece of work in14 days and B can do the same work in 5 days. If B starts the work and they work on alternative days. Find total no. of days to finish the complete work.
Q. pipe M can fill one-third of a tank in 4 hours and pipe N can fill 20% of the same tank in 3 hours. If half the tank is filled already then find time taken to fill the tank completely when both the pipes are opened together.
R. 30 men could do a job in 20 days. Due to the inclusion of some more men the work got completed 3/5 times. Find the number of men added.
P. let total work to be done (LCM of 14 & 5) = 70 unit One day work of A = 70/14 = 5 unit One day work of B = 70/5 = 14 unit One day work of A & B = 14+5 = 19 unit In three days they will work = 3×19 = 57 unit Remaining work = 70-57 = 13 unit Since work is started by B Time taken by B to complete rest work = 13/14 = 0.9 days Total time taken to finish the work = 3+0.9 = 3.9 days (approx) Q. Pipe M can fill one-third of the tank in 4 hrs. Pipe M will fill this tank in 4×3 = 12 hrs. Pipe M can fill 20% of the tank in 3 hrs. Pipe M will fill this tank in 5×3 = 15 hrs. Both pipe M & N has to fill (LCM of 12 & 15) = 60 unit Pipe M will fill in 1 hrs. = 60/12 = 5 unit Pipe N will fill in 1 hrs. = 60/15 = 4 unit Both Pipe together will fill = 5+4 = 9 unit Since tank is half filled, hence both tap has to fill only 30 unit Time taken to fill the tank completely = 30/9 = 3.33 hrs. R. let x men included Then 30 men completes the work in 20 days And (30+x) men will complete in 3/5 of 20 days = 12 days 30×20 = (30+x) ×12 X = 20 men Hence we can see that Q < P < R
A Tank has two pipes one can fill it with water in 16 hours and other can empty it in 10 hours. In how many hours will the Tank be emptied if both the p...
Pipe P can fill half of the tank in 8 hrs 5 min and pipe Q can fill the same tank completely in 16 hrs 5 min. Another pipe R can empty the full tank in ...
Pipe ‘A’ can fill a tank in 60 hours whereas leak ‘A’ can empty it in 70 hours. If they both operate along with pipe ‘B’, then the given tan...
Pipe ‘A’ can fill a tank in 40 hours whereas leak ‘A’ can empty it in 50 hours. If they both operate along with pipe ‘B’, then the given tan...
Two pipes A and B can fill a tank in 4 hours and 7 hours respectively & a waste pipe C can empty in 8 hours. If pipes A , B & C are opened at 7a...
Pipe ‘A’ can fill a tank in 20 hours while pipe ‘B’ takes 25 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 1...
Two pipes 'P' and 'Q' together can fill a tank in 16 minutes while 'Q' alone can fill the tank in 24 minutes. How much time does pipe 'P' alone need to ...
Pipe ‘A’ can fill a tank in 10 hours while pipe ‘B’ can empty it in 12 hours. They were operated on alternate hours starting with pipe ‘A’. ...
Pipe A can fill a tank in 50% less time than it takes pipe B to empty it, while pipe C can fill the same tank in 25% less time than pipe B's emptying du...
In what time would a Cistern be filled by three pipes whose diameter are 2cm, 2 2/3cm and 4cm running together, where the largest pipe alone fill it in ...
