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RRB Paramedical Staff Nurse Model Paper 4
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© examsnet.com
Question : 41
Total: 100
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
© examsnet.com
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