Pipes and Cistern

Pipe A can fill a tank in $6$ hours. Pipe B can fill it in$4$ hours and pipe C can empty it in $3$ hours. All the pipes are opened together and after $18$ hours pipe A is closed Then find out the tank will be emptied in how much time?

The first two of the three pipes can fill an empty tank in $10.8 \mathrm{hours}$ and $21.6 \mathrm{hours}$ respectively, while the third pipe can empty the filled tank in $18 \mathrm{hours}$. If the tank is empty and all three pipes are opened simultaneously, then in how many hours will the tank be filled?

There are $3$ pipes X, Y, and Z that can fill a tank in $8$ hours,$10$ hours, and $12$ hours respectively, all three pipes are opened alternatively one by one for one hour.in how many hours the empty tank can be filled.

$15 \mathrm{hours}$ of rain can fill $60\%$of a pond. A man can empty the pond in $50 \mathrm{hours}$. The pond was completely empty when it started raining. If it rained for $12 \mathrm{hours}$ , how much time will it take for the man to empty the Pond ?
 

Two machines fill a juice container. Machine B is $62.5\%$ as efficient as Machine A. If Machine A fills the tank completely in $2.5 \mathrm{hours}$, how much time will it take for both the machines to fill $65\%$ of the container ?
 

Two inlets A and B can fill an empty tank in $36 hours$ and $60 hours$ respectively. In how much time, will they together fill the $\frac{1}{6}\mathrm{th}$ part of the tank?

Direction - solve the question:

If Pipes A and B can fill a tank in $15$ min and $20$ mins respectively and pipe C empties the tank in $12$ mins. What will be the time taken by A, B and C together to fill the tank completely?

Then on two pipes $P$ and $Q$ can fill the tank in $20 hours$ and $40 hours$  respectively also Pipe $R$ is attached which can empty the tank in $120 hours$. if all pipes working together and at $2 pm$ and after $10 hours$ pipe $R$ is cleared when will the tank filled?

The ratio of efficiencies of two outlet pipes is $2:3$. There is a third filling pipe which efficiency is $\frac{8}{5}$ Of the average efficiency of two outlet pipes can fill an empty tank in $70$ Minutes. In how much time both the emptying pipe can empty the tank when it is completely filled?

Pipe P can fill a tank is $12$ hours & Pipe Q can empty tank is $18$ hours. Both pipe are opened at $6$ am and after some time Q is closed and the tank is full at $8$ pm on the same day. At what time was B closed?

Pipe A and B can fill a tank is $20$ minutes and $25$ minutes respectively. Both were opened simultaneously. After $4$ minutes, A was closed. Find the time taken from then to fill the tank.

Two pipes can fill a tank is $18$ minutes and $27$ minutes. A third pipe can empty the tank (where full) in $6$ mins. On the three pipes are opened when the tank was ${\frac{2}{3}}^{th}$ full. In how many minutes will the tank become empty?

Two pipes A & B can fill a tank in $8$ and $24$ hours respectively. there is an outlet exactly at ${\frac{2}{3}}^{th}$ of the height above the base which can empty the top one-third of the tank be full, in $4$ hours. In how many hours, will the empty tank be full, if both in e pipes and the outlet are opened simultaneously?

P and Q are imlet pipes while R is outlet pipe. Pipe P supplies mates at $50 ltr/hours.$ Q can fill a tank in $4$ hours. All the pipes are simultaneously opened and tank gets filled in $1$ hours. What is capacity of tank ?

M filling pipes, $p_1, p_2,.....p_N \left(Where N>10\right)$, are attached to the tank. The rate of filling of $p_1$ where $C>1$, is equal to twice the combined rate $8$ filling of all the covers numbered pipes. If the combined rate of filling of all lowered numbered pipes. If the time taken by $p_{N·3}$ to fill the tank is $128$ minutes, find the  time taken by $p_N$ to fill the tank

Pipe A takes $4$ hours to fill a tank. Tap B takes $6$ hours to fill the tank. If both the taps weep opened simult; by the time the tank was full, what fraction of the tank was filled by tap A $?$

Two taps $\mathrm{X}$ and $\mathrm{Y}$ can fill a tank in $12$minutes and $15$minutes, respectively. If both the taps are opened simultaneously, and tap $\mathrm{X}$ is closed after $3$ minutes, then how much more time will it take to fill the tank with the help of tap $\mathrm{Y}$?

A tap can empty a tank in $36 \mathrm{hrs}$. After one-third of the tank is empty $4$ more similar taps are opened. What is the total time taken by the taps to empty the tank completely?

Pipe A can fill a tank in $4$ hours and another pipe B can empty the same tank in $6$ hours. Pipe A is opened and after $3$ hours B is also opened. In how many hours, the tank will be filled?

A pipe can fill an empty tank in $5$ hours. After $\frac{3}{5}$ th part the tank is filled, another pipe of same efficiency is opened. In how many hours, the tank will be filled?