Question

Two pipes a and b can separately fill a cistern in 220 and 330 minutes. Together they can fill it in?

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

132 minutes.

Step-by-step explanation:

Pipe A can fill a cistern in minutes = 220

Pipe A can fill a part of cistern in 1 minute = $\frac{1}{220}$

Pipe B can fill a cistern in minutes = 330

Pipe B can fill a part of cistern in 1 minute = $\frac{1}{330}$

Together they can fill a part of cistern in 1 minute = $\frac{1}{330}+\frac{1}{220}$

                                                                                  = $\frac{1}{132}$

They can fill  $\frac{1}{132}$ part of cistern together in minutes = 1

They can fill whole cistern together in minutes = $\frac{1}{\frac{1}{132}}$

                                                                              = $132$

Hence Together they can fill it in 132 minutes.