book Maths Puzzle Numerical Ability

{{{ (1/2) x + (3/4) y = 6 }}}

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book Other Question

Two cyclists start from the same point and travel in opposite directions. One is averaging 12 mph, while the other is averaging 16 mph. After how long will they be 98 miles apart? I am not sure how to solve this problem when there is a x^3

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