exam Maths Puzzle Numerical Ability

5x-4y=1
3x-6y=6

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exam Other Question

3. Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle.

y=time
xy=600
(x+20)(y-1)=600

Now what do I do? A garden area is 30ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?