RRB Paramedical Staff Nurse Model Paper 4

Question : 41 of 100

Marks: +1, -0

Two pipes can fill a cistern in 3 h and 4 h respectively and a waste pipe can empty it in 2 h. If all the three pipes are kept open, then the cistern will be filled in

5 h
8 h
10 h
12 h

Validate

Solution:

Given, part of the cistern filled by

A=3{h}

Part of cistem filled by

B=4 h

And part of the cistem emptied by

C=2 h

Then, part of the cistern filled in

1{h}

, when all the three pipes are opened

=\;{1}/{3}+\;{1}/{4}-\;{1}/{2}

=\;{4+3-6}/{12}=\;{1}/{12}

Hence, the cistem will be filled in 12 h

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