Find the area

Question

A person jogged 10 times along the perimeter of a rectangular field at the rate of 12 kilometers per hour for 30 minutes. If the field has a length that is twice its width, find the area of the field in square meters.

Answer 1

distance jogged = 12 km/hr * 30 min = 12 km/hr *1/2 hr = 6 km

10x around = 6 km means 1 time around is 600 m = perimeter

perimeter is 2(2w+w) = 6w = 600 m 

width w = 100 m

length = 2w = 200 m

Area = width * length = 100 * 200 = 20,000 m²