James drove to work in such heavy traffic that it took him 2 hours to get in to work. On
his way home, traffic was much lighter and he was able to drive 30 mph faster. This let
him get home in just ½ an hour. How fast was James driving on his way to work?
Let James was driving at x mph while going to work.
It took him 2 hours to go to work.
So, distance= time x speed= 2x miles
While coming back he was driving 30 mph faster. So his speed was (x+30) mph.
And from earlier...
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