RRB Paramedical Staff Nurse Model Paper 1

Question : 46 of 100

Marks: +1, -0

There are two taps to fill a tank and a third to empty it. When the third tap is closed, they can fill the tank in 10 min and 12 min, respectively. If all the three taps be opened, the tank is filled in 15 min. If the first two taps are closed, in approximately what time can the third tap empty the when it is full?

8 min and 34 second
7 min
6 min
12 min

Validate

Solution:

One minute's work of third tap

=(\;{1}/{10}+\;{1}/{12})-\;{1}/{15}

=7/60

∴ time taken by third tap to empty the filled tank

=60/7

min or 8 min 34 sec

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