book Maths Puzzle Numerical Ability

I am not sure how to solve this problem when there is a x^3

x^3 + y = 0
x^2 - y + 0

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book Other Question

(x^3-1)/(x-1)

thank you for your time Two trains are traveling to the same city. The second train has to travel 264 miles in the same time the first train travels 228 miles. If the second train's rate of travel is 6