RRB Paramedical Staff Nurse Model Paper 4

Question : 48 of 100

Marks: +1, -0

A tap can fill an empty tank in 12 h and another tap can empty half the tank in 10 h. If both the taps are opened simultaneously, how long would it take for the empty tank to be filled to half its capacity?

30 h
20 h
15 h
12 h

Validate

Solution:

Given, part of the tank, filled by

A=12 h

And half the tank emptied by

B=10

h
Then, part of the tank filled in

1 {h}

=\;{1}/{12}-\;{1}/{20}

=\;{5-3}/{60}

=\;{2}/{60}=\;{1}/{30}

Hence, tank will be filled in 30h

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