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The length x of a rectangle is decreasin...

The length x of a rectangle is decreasing at the rate of 3 cm/sec and its breadth y is increasing at the rate of 2 cm/sec. At the instant, when x = 100 cm and y = 60 cm, the rate of change of its area is

A

`20 cm^2//sec`

B

`-20 cm//sec^2`

C

20/sec

D

none of these

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