book Maths Puzzle Numerical Ability

You propose to build a space ship that allows the entire population of the United States (280 milliom) to leave the earth. Your plans allocate an average space of 1,000(=10*10*10)

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book Other Question
I tried this, can someone just let me know if I am right?

(x^-1+y^-1)/(x^-1y)
I cancelled out the x^-1, which left me with y^-1/y, which I think is (1/y)/(y)

Thanks!! Is the formula used to figure out the cube of a carton - length x width x height divided by 1726?