book Maths Puzzle Numerical Ability

Mary runs at a rate of 5 miles per hour to her friend's house. She runs back at 10 miles per hour and spends one hour less on the trip. How far away is her friend 's house?

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book Other Question

i could really use someones help with this one! translate "nine less than the total of five and a number"into a mathematical expression. thanks! What is the function and conclusion to these two quadratic equations?

9x^2-24x+16=0

4+20x=-25x^2