Pipe and cistern is more similar to Time and Work, First of all we check the nature of pipes.
Suppose, pipe A can fill a tank, mean nature of Pipe A is positive
And pipe B can empty a tank, mean nature of pipe B is negative.
Work to be done is usually considered as one unit. It may be, constructing a wall or laying a road, filling up or emptying a tank or cistern or eating certain amount of food.
If there is more than one person carrying out the work, it is assumed that each person does the same amount of work each day and all the persons do exactly the same amount of work.
Eg: If a tap can fill a tank in 20 minutes, then in one minute, it can fill 1/20^{th} part of tank.
Pipes and Cisterns will cover the basic concepts and easy to solve. Test conducted to know the logical thinking capacity of a person.
Pipes and Cisterns problems will use for all competitive exams like bank exams etc.
