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| Suppose the length x of a rectangle increase and width y decrease with the same speed simultaneously. Then with what speed with respect to time does the perimeter of the rectangle change? |
The rate of change of perimeter is 0 cm/s when x=10cm and y = 10 cm. The rate of change of perimeter is 0 cm/s when x=100 cm and y = 100 cm. The rate of change of perimeter is 0 cm/s for any value of x and y. None of the above |
| The rate of change of perimeter is 0 cm/s for any value of x and y. |
| dP/dt = 2(dx/dt +dy/dt) but dx/dt = - dy/dt |
