book Maths Puzzle Numerical Ability

[-2y]=[4-5x]
[x]=[y+5]

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In one of the early rocket experiments on The Planet of the Apes, a banana was launched straight upward so that its height in feet above the ground after t seconds was given by the function h= -42t^2+504t. When did the banana hit the ground? 4+X GREATER OR EQUAL TO 2(7X+1)