book Maths Puzzle Numerical Ability

A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour.

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book Other Question
I need to know how to define a variable and write an inequality to model this situation. Not sure I understand what they are wanting. "There are over 20 species of crocodiles." Find the axis of symmetry
y=-x^2-x-7