Question

If the area of rectangular plot is $15ha$and its breadth is $300m$ , then the distance covered by girl in walking around it is :

• A. $800m$
• B. $1km600m$
• C. $3km200m$
• D. $1km200m$

Answer 1

The correct option is B

$1km600m$

Converting $ha$into $m$

$$\begin{gathered} 1ha=10000m^2 \\ 15ha=150000m^2 \end{gathered}$$

Calculating length of plot

Area of rectangle $=length\times breadth$

$$\begin{gathered} 150000=length\times 300 \\ length=\frac{150000}{300} \\ length=500m \end{gathered}$$

Calculating perimeter of plot

Perimeter of rectangle $=2(length+breadth)$

$$\begin{gathered} =2(500+300) \\ =2(800) \\ =1600m=1km600m \end{gathered}$$

Hence , distance covered by girl is $1km600m$