Question

two inlet pipes A and B can fill an empty cistern in 4 hours and 8 hours respectively . If both are opened together in the empty cistern ,how much time will they take to filled it completely

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer-In 1 hr in let A can fill $\frac{1}{15}.10$ art of the empty tank.

And In 1 hr in let B can fill $\frac{1}{20}$ art of empty tank.

In 1 hr outlet can empty $\frac{1}{12}$ art of full tank.

$\therefore$ In 1 hr in let (A+B) and outlet can fill

$\Rightarrow (\frac{1}{15}+\frac{1}{20} )-\frac{1}{12}$

$= (\frac{4+3}{60} )-\frac{1}{12}$

$=\frac{7}{60}-\frac{1}{12}$

$=\frac{7-5}{60}$

$=\frac{2}{60}\\ =\frac{1}{30}$per hr

$\therefore$ Time taken by Inlet (A+B) and outlet is $30hrs$.

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