CAT 2021 Slot 2 QA Q21 Time & Work

Question 21 of the Quantitative Ability (QA) section, CAT 2021 Slot 2, with CAT's official answer.

Two pipes A and B are attached to an empty water tank. Pipe A fills the tank while pipe B drains it. If pipe A is opened at 2 pm and pipe B is opened at 3 pm, then the tank becomes full at 10 pm. Instead, if pipe A is opened at 2 pm and pipe B is opened at 4 pm, then the tank becomes full at 6 pm. If pipe B is not opened at all, then the time, in minutes, taken to fill the tank is
  1. A
    140
  2. B
    120
  3. C
    144
  4. D
    264

Answer: (C) 144 Time & Work MCQ

A worked solution for this question is being written. Meanwhile, practise it in a timed mock and see how other aspirants did.

Same concept in other years

See every question on Pipes and cisterns with a draining pipe: net rate = fill − drain.

More Time & Work questions from CAT

All 34 Time & Work questions asked since 2017.