I think you forgot to give the options along with the question. based on my assumption and knowledge, i am answering the question. The time it takes to transport goods has decreased over time, causing trade to increase. I hope that the answer has come to your help.
I don't know the math equations on how to do it to be honest, but I know you're just looking for the answer.
60+60=120 260-120=140 140/2=70 70*60=4200
Your answer is 4200ft^2
