RRB Paramedical Staff Nurse Model Paper 3

Question : 41 of 100

Marks: +1, -0

Two pipes can fill a tank in 15 h and 20h respectively, while the third can tank empty it in 30h. If all the pipes are opened simultaneously, the empty tank will be filled in

10 h
12 h
15 h
31/2 h

Validate

Solution:

Given, part of tank filled by

\A=15h

Part of tank filled by

\B=20h

and part of tank emptied by

\C=30h

Then, part of tank filled in 1 h when all three pipes are opened simultaneously

=\;{1}/{15}+\;{1}/{20}-\;{1}/{30}

=\;{4+3-2}/{60}

=\;{5}/{60}=\;{1}/{12}

Hence, the tank will be filled in 12 h.

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