Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours.
How long will it take to fill the tank, if all the three pipes are opened together?

Q. Pipe

A

can fill a tank in

20

hours while Pipe

B

can fill it in

30

hours and Pipe

C

can empty the same tank in

40

hours. If all the pipes are opened together, what will be the time needed to fill the tank completely?

Q. Two pipes can fill a tank in

15

hours and

20

hours respectively, while the third can empty it in

30

hours. If all the pipes are opened simultaneously, the empty tank will be filled in

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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in.

The correct option is C 3917 hoursNet part fillef in 1 hour (15+16−112)=1760∴ The tank will be full in 6017 hours i.e., 3917 hours.

Pipes A and B can fill a tank in $5$ and $6$ hours respectively. Pipe C can empty it in $12$ hours. If all the three pipes are opened together, then the tank will be filled in.

The correct option is C $3 \frac{9}{17}$ hours
Net part fillef in $1$ hour $(\frac{1}{5} + \frac{1}{6} - \frac{1}{12}) = \frac{17}{60}$
$∴$ The tank will be full in $\frac{60}{17}$ hours i.e., $3 \frac{9}{17}$ hours.