Solve each part of given problem:
Problem: An acre, a unit of land measurement still in wide use, has a length of one furlong (1:8 mi) and width-tenth of its length.
Part I: How many acres are in 3 square miles?
Part II: How many square feet are in 3 acres?
Part III: An acre-foot is the volume of water that would cover 1 acre of flat land to a depth of 1 foot. How many gallons are in 3acre-foot?
I am not able to get the right answer for above problem please help me.