book Maths Puzzle Numerical Ability

A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downstream. The river flows at 2 miles per hours. What is the speed of the boat in still water?

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book Other Question

Solve the following system by substitution
8x-4=16
y=2x-4
Please solve following quadratic equations using method completing the square:
x^2 + x = -1