exam Maths Puzzle Numerical Ability

A boat can travel 5 miles upstream and 5 miles downstream in a total of 6 hours. If the speed of the current is 2 miles per hour, what is the speed of the boat in still water?

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Another problem I'm having troubles with is:
perform the indicated operation and simplify:

1- 2x-1 over x^2-4 over or divided by 1+ 1/x-2

Translation:
1- 2x-1 divided by x eighty liters of a 40% antifreeze solution had to be strengthened so it contained 52% antifreeze. how much should be added?