exam Maths Puzzle Numerical Ability

A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water.

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exam Other Question

A sum $2300 is invested, part of it at 10% interest and the reaminder at 12%. If the interest earned by the 12% investment is $100 more than the intrest earned by the 10% investment, find the amount invested at each rate?

Thanks! Please help me! Simplify and evaluate (x^7y^-4z^0/5^-2x^3y^-8z^-9)^2 This is a homework question. Your help is appreciated.