Through a rectangular field of length $90\ m$ and breadth $60\ m$, two roads are constructed which are parallel to the sides and cut each other at right angles through the centre of the fields. If the width of each road is $3\ m$, find
$(i)$ the area covered by the roads.
$(ii)$ the cost of constructing the roads at the rate of $₹ 110\ per\ m^2$.
Length of the road along the length of the field$= 90\ m$
Breadth$= 3\ m$
Area of the road$= l\times b$
$=90m\times3m=270m^2$
Similarly, the area of the road parallel to the breadth of the field$=l\times b$
$=60\ m\times3\ m=180\ m^2$
Area of the common portion$=3\ m\times3\ m=9m^2$
$(i)$. Area of the two roads
$=270\ m^2+180\ m^2-9\ m^2$
$=450\ m^2-9\ m^2=441\ m^2$
$(ii)$. Cost of constructing the roads
$=Rs\ 110\times441=Rs\ 48,510$
Related Articles
- Two cross roads, each of width $10\ m$, cut at right angles through the centre of a rectangular park of length $700\ m$ and breadth $300\ m$ and parallel to its sides. Find the area of the roads. Also find the area of the park excluding cross roads. Give the answer in hectares.
- A rectangular plot of land is \( 300 \mathrm{~m} \) long and \( 250 \mathrm{~m} \) broad. It has two roads, each 3 metres wide running midway within it one parallel to the length and the other parallel to the breadth. Find the area of the roads. Also, calculate the cost of constructing the roads at Rs. 50 per square metre.
- The diagonals of a field in the form of a quadrilateral are $106\ m$ and $80\ m$ and intersect each other at right angles. Find the cost of cultivating the field at the rate of Rs. $25.50$ per $100\ m^2$.
- The length and breadth of a rectangular field are 25 m and 10 m respectively. Find the area of the field and cost of leveling the field at Rs. 50 per square metre.
- A verandah of width $2.25\ m$ is constructed all along outside a room which is $5.5\ m$ long and $4\ m$ wide. Find:$(i)$ the area of the verandah.$(ii)$ the cost of cementing the floor of the verandah at the rate of $₹\ 200\ per\ m^2$
- The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per sq m.
- The length, breadth and height of a room are \( 5 \mathrm{~m}, 4 \mathrm{~m} \) and \( 3 \mathrm{~m} \) respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs. \( 7.50 \) per \( \mathrm{m}^{2} \).
- Find the cost of fencing a rectangular park of length \( 175 \mathrm{~m} \) and breadth \( 125 \mathrm{~m} \) at the rate of \( Rs.\ 12 \) per metre.
- The perimeter of a rectangular field is 82 m and its area is $400\ m^2$. Find the breadth of the rectangle.
- A field is in the shape of a trapezium whose parallel sides are \( 25 \mathrm{~m} \) and \( 10 \mathrm{~m} \). The non-parallel sides are \( 14 \mathrm{~m} \) and \( 13 \mathrm{~m} \). Find the area of the field.
- A door of length $2\ m$ and breadth $1\ m$ is fitted in a wall. The length of the wall is $4.5\ m$ and the breadth is $3.6\ m$ $(Fig11.6)$. Find the cost of white washing the wall, if the rate of white washing the wall is $₹\ 20\ per\ m^2$."
- The diameter of a circular field is $56\ m$. Find the circumference and hence find the cost of fencing it at the rate of $80\ per\ m$.
- Find the cost of digging a cuboidal pit $8\ m$ long, $6\ m$ broad and $3\ m$ deep at the rate of $Rs.\ 30$ per $m^3$.
- A circular pond is 17.5 m in diameter. It is surrounded by a 2 m wide path. Find the cost of constructing the path at the rate of Rs. 25 per $m^2$.
- The length and breadth of a rectangular field are in the ratio of 3: 2. If the perimeter of the field is 80 m, find its breadth( in metres)
Kickstart Your Career
Get certified by completing the course
Get Started