exam Maths Puzzle Numerical Ability

what the solution to rational equation that simlifies a linear equation 3/4z-12-4=6/z-3

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A car leaves a city and goes north at a rate of 50 mi/h at 2 P.M. One hour later a second car leaves, traveling south at a rate of 40 mi/h. At what time will the two cars be 320 mi apart? The rectangle of maximum area that could be inscribed inside a right angle triangle has dimensions equal to half the lengths of the sides adjacent to the rectangle. Prove that this