book Maths Puzzle Numerical Ability

Please help! I don't know how to set-up this problem.

A rock is dropped into a well, and 3 seconds later the sound of its splash is heard. How deep is the well? Assume that soun

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book Other Question

Is the formula used to figure out the cube of a carton - length x width x height divided by 1726? The figure show the graph of the polynomial function y = f(x). For which of the values k = 0, 1, 2, or 3 will the equation f(x) = k have complex roots.

How would I go about solv