Central park is a rectangle with an area of 840 acres. it is 1/2 a mile wide. one acre is 43,560 square feet. two people start at the southwest corner at 1: 30 pm and start walking round the park in opposite directions. one walks at 9 mph, the other walks at 4 mph. how long until they meet again?

Points j and k plotted on the coordinate grid are two vertices of rectangle jklm rectangle jklm has an area of 7 square units point j is located at 2,1 and point k is located at -5,1 each vertex of the rectangle is located at a point that has integer coordinates. what is the perimeter of rectangle jklm? (need answer asap)