let

l = the length of the rectangular plot

w = the width of the rectangular plot

a rectangular plot of land is 35ft longer that its width

l = w + 35

the width is 80 ft that is w = 80 ft thus

l = 80 + 35 = 115 ft

the area of the plot is the are of a rectangle thus the are A = l*w

A = 115*80

A = 9200 ft^2

the are of the rectangular plot of land is 9200 ft^2,