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The length of a rectangle is decreasing at a rate of 3 cm/sec and breadth is increasing at a rate of 4 cm/sec. Find the rate of change of its (a) perimeter (b) area, when the length and breadth of rectangle are 7 cm and 8 cm respectively.

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`(a) 2 cm//sec (b) 4 cm^(2)//sec`,Increase
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NAGEEN PRAKASHAN-APPLICATIONS OF DERIVATIVES-Exercise 6a
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