Question 1008726
Perimeter P = 2L + 2W = 840  and we also have L = W + 188.  The substitute and we have
2(W + 188) + 2W = 840
2W + 376 + 2W = 840
4W + 376 = 840
4W = 464
W = 116 feet
L = W + 188 = 304 feet