Question

An empty cistern has three pipes A, B and C. A and B can fill it in 45hrs and 36 hours respectively and C can empty it in 37 1/2 hr. After how much time draining pipe should be closed so that cistern is filled in 32 hrs. 371

a) 20.5hrs b) 21hrs c) 22.5hrs d) 16hrs​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

22.5

Step-by-step explanation:

45. 20.

36. 25. LCM 900

75/2. 24

than (20+25)=45×32=1440 total filled

1440-900=540/24=22.5hrs