Pick 1 of 3 doors odds are 1 in 3, after pick an incorrect door is opened what are the odds if you change your pick that you will be correct

If you already picked one wrong door then it is a 50/50 chance you will get the correct door or 1/2 or 1 of 2 or  .5

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.