Answer:
the width is 68m
Explanation:
Area can be calculated as

a = area
a = areal = length
a = areal = lengthw = width
Our given is
a = 5916m2
l = 87 m
w = X
We can solve it as.
a=l×w
5916m2 = 87 m × X
5916m2/87m = (87 m ×X)/87m
X = 68 m
so the width is 68m .