exam Maths Puzzle Numerical Ability

-3x>0=x>3

3x-4<11=3x<11+4=3x<15=x<15/3=x<5

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A dog owner has 250 feet of fencing to enclose a rectangular run for his dogs. If he wants the maximum possible area, what should the length and width of the rectangle be? On planet X, an object falls 18 feet in 3 seconds. Knowing the distance it falls varies directly with the square of the time of fall, how long does it take an object to fall 100 feet? Round your answer to three decimal places