Guys, Please stop arguing if it 12 or 40minutes walk. Has anybody heard someting called "speed" in physics? if you walk 10km/hr, it takes 40minutes or if you walk 20km/hr it takes 20minutes...thas why scientists use more applicable terminology when they talk about these kind of stuff. So end of the discussion; It is about 4km. do your own math how long it takes you to walk... it is very hot here and the books and the computer makes it harder. best thing is get a car..