book Maths Puzzle Numerical Ability

If you divide a iron rod that is 10m long into three equal pieces, what will be the length of each pieces? And if it wheighs 10kg and is equally divided into three pieces, what will be the weight of each piece?

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book Other Question

does a negative number x a negative number equal a positive number?

ex: -4x-4=

If so, can you explain the formula? Thank you I am needing help with the following problem please:
Evaluate 2x(squared)(Y+Z) where X=2, Y=3 Z=4

I got 15 but I am second guessing myself and wanted to see if I worked the problem correctly. Thanks for your help...