book Maths Puzzle Numerical Ability

What is the largest rectangular area that can be enclosed with 30 feet of fencing? I need the dimensions.

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2x2 and 3x3 Systems: answer has to be in ordered pairs, or ordered triples.

Question 1. 2(x-3y)+3(y-2)= 4(x-y)-5
3/2x - 5/6y = -1

Question 2. 2x - y + z= -4 a small plane flying in the same direction as the wind, travelled 600 km in 2 h. The return trip, flying against the wind, took 3 h. Find the speed of the plane and the wind.