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CAT Pipes and Cisterns questions with solutions

Filling and emptying problems. 11 questions from our 2016–2021 CAT pattern papers. Each has the answer and a full solution.

CAT 2021

Pipes A and B can fill an empty tank in 20 minutes and 30 minutes respectively, and outlet C can empty the full tank in 15 minutes. All three are…CAT 2021 Slot 1 · medium

CAT 2020

Pipe A can fill an empty tank in 10 hours and pipe B can fill it in 15 hours, while pipe C can empty the full tank in 12 hours. All three pipes are…CAT 2020 Slot 1 · medium
Pipes A and B can fill a tank in 10 hours and 15 hours respectively, while pipe C can empty the full tank in 12 hours. If all three pipes are opened…CAT 2020 Slot 2 · easy

CAT 2019

All three pipes are opened together on the empty tank, and after 4 minutes pipe C is closed.CAT 2019 Slot 1 · medium
All three pipes are opened together on the empty tank, and C is closed after 5 minutes.CAT 2019 Slot 2 · medium

CAT 2018

CAT 2017

CAT 2016