Given:
There are given that the length and width are:

Step-by-step explanation:
(a):
To find the area of farmland, we need to use the area formula for rectangle:
So,
First find the given value from km to mies.
So,

From the frmula:

Then,
Put all the values into the above formula:
So,

Final answer:
Hence, the area is shown below:
