Answer:
ummm u did not add the statements to the question
Step-by-step explanation:
but a polygon ABCD might not be a rectangle if:
Cannot solve fir x because traingles are not similar
11+8+12=15+10+x
31=25+x
X=31-25
X=6
p(80+60)=560
p(140)=560
560/140 = 4 hours