exam Maths Puzzle Numerical Ability

This was from standardized test (ASSET):

Tractors A,B, C & D are equipped identically. Together A,B & C can plow 180 acres in 2 hrs. How many acres can all 4 (A, B, C & D) plow in 3 hrs?

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exam Other Question
solve: x/x^2 - 1 + 1/x - 1 = 1/x + 1

I could be wrong.... no solution? If I have an equilateral triangle with a hypotenuse of 82 cm, what is the length of the two equal sides?