Pipes and Cisterns: Formula and Tricks with Problem (Question) and Solutions

Pipes and Cisterns Problems on pipes and cisterns are based on the basic concept of time and work.

Pipes are connected to a tank or cistern and are used to fill or empty the tank or cistern.

Basic fundamental of this topic is similar to time and work. The only difference lies in the fact that here work can be positive (filling the tank) as well as negative (emptying the tank) whereas in time and work, the work done is always positive.

Inlet A pipe connected with a tank or cistern or a reservoir that fills it, is known as an inlet.

Outlet A pipe connected with a tank or cistern or a reservoir that empties it, is known as an outlet.

Examples

Ex: If two pipes A and B can fill a tank in 20 and 30 min separately. If both pipes are opened, then tank will be filled in

(a) 10 min

(b) 16 min

(c) 14 min

(d) 12 min

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