A rectangular piece of land measuring $0.7 k m$ by $0.5 k m$ is to be fenced with four rounds of wires. What length of wire is needed?

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Solution

Step 1: Perimeter of rectangular land
Length of rectangular land $(l)$ $=$ $0.7 k m$
Breadth of rectangular land $(b)$ $=$ $0.5 k m$
Perimeter of rectangular land $=$ $2 (l + b)$
$= 2 (0.7 + 0.5) k m = 2 \times 1.2 k m = 2.4 k m$
Step 2: Length of wire needed for fencing four rounds of rectangular land
Length of wire needed to fence for $1$ round $= 2.4 k m$
Length of wire needed to fence for $4$ rounds $= 2.4 \times 4 k m = 9.6 k m$
Therefore, Length of wire needed for fencing four rounds of rectangular land is $9.6 k m$ .

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