Question 831084
I sure hope Kevin was carrying some sort of protection as both those cities are dangerous. (http://content.time.com/time/photogallery/0,29307,1882089,00.html)
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Are you sure that your numbers are correct?  Because, if it's a 540km trip, then it's 3 hours at 120kph and 4 hours at 45kph. (3*120 = 360, 4*45=180, 360+180=540).
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At 545, it ends up a long fraction (3 and change) and just under 4 hours for the 45kph.  Please check and repost.