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

You have a triangle 6 1/4 high, 24 long, and Hyp of 24.8. one known angle of 90 degrees, what are the other two angles? If you borrow $100 and pay back $105 at the end of one month, then what is the simple annual interest rate?