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

is v(v-3) = v^2 + 6 a quadratic equation and if so what is the solution? can you please send me practice problems of both 2 variable and 3 variable linear equations. And the answers on another email marked answers so i can check to make sure i get them