book Maths Puzzle Numerical Ability

A machine can produce article A in 12 minutes or article B in 16 minutes. If it is planned to produce twice as many of A as B in a working week of 40 hours, how many of each will b

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Can you please help?

Two problems:

-x^2 -2x/x + 1 < 0

7x -1 / x^2 - 1 < 0 using the formula h= -16t + 20 +300
supose you are standing on top of a 300ft tall building, right next to the edge and you throw a ball straight up in the air.
How long before