The feasible region represented by the constraints:
$$ \begin{aligned} & x+2 y \leq 120 \\ & x+y \geq 60 \\ & x-2 y \geq 0 \\ & x \geq 0 \text { and } y \geq 0 \end{aligned} $$
A
C
B
D
$$ \text { The range of the relation } R=\left\{(x, y): y=x+\frac{6}{x} \text {; where } x, y \in \mathbb{N} \text { and } x<6\right\} \text { is: } $$
$\{1,2,3\}$
$\{5,6\}$
$\left\{5, \frac{11}{2}\right\}$
$\{5,7\}$
Let A be a square matrix of order $3 \times 3$. If $|A|=-4$, then the value of $\left|\frac{A^{-1}}{-2}\right|$ is:
$-1$
$2$
$\frac{1}{32}$
$-\frac{1}{16}$
An open hemispherical storage tank has radius 13 m . Oil flows into the tank such that the depth ' $\boldsymbol{h}$ ' of oil in the tank changes at the rate of $3 \mathrm{~m} / \mathrm{hr}$. When the depth $\boldsymbol{h}=1 \mathrm{~m}$, the rate of change of the area of the top surface of the oil is
$72 \pi \mathrm{~m}^2 / \mathrm{hr}$
$75 \pi \mathrm{~m}^2 / \mathrm{hr}$
$24 \pi \mathrm{~m}^2 / \mathrm{hr}$
$26 \pi \mathrm{~m}^2 / \mathrm{hr}$
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