MathDB

A

and

B

are two cylindrical containers that contain water. The height of the water at

A

1000

cm and at

B

350

cm. Using a pump, water is transferred from

A

B

. It is noted that, in container

A

, the height of the water decreases

4

cm per minute and in

B

it increases

9

cm per minute. After how much time, since the pump was started, will the heights at

A

and

B

be the same?

Problem Statement