RRB Paramedical Staff Nurse Model Paper 3

Question : 48 of 100

Marks: +1, -0

A tap can fill a cistern in 40 min and a second tap can empty the filled cistern in 60 min. By mistake without closing the second tap, the first tap was opened. In how many minutes will the empty cistern be filled?

Validate

Solution:

Given, part of cistern filled by A = 40 min
And emptied by B = 60 min
Part of the cistern filled in 1 min by both the taps

=\;{1}/{40}-\;{1}/{60}

=\;{3-2}/{120}=\;{1}/{120}

Hence, empty cistern will be filled in 120 min

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