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Two parallel sides of a rectangle are in...

Two parallel sides of a rectangle are increasing at the rate of `4 cm //sec` while the other two sides are decreasing in such a way that the area of the rectangle remains constant at `80 cm ^(2)`. When the angle of a decreasing side is 8 cm , perimeter of the rectangle is changing at the rate of

A

`0.8 cm //sec`.

B

`1.6 cm//sec`

C

`0.6 cm//sec`.

D

`16 cm //sec`.

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The correct Answer is:
B
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