book Maths Puzzle Numerical Ability

The vertices of a right triangle are (-12,8), (24,8), and (24,-7). Find the lenght of the hypotenuse of the triangle.

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My question says to solve the system of this inequalitie by graphing.
y-x<0
3y>2x-15 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could y Sally traveled in a boat up the river, against its 1 km/h current and back again in 55 minutes. She traveled 5 km in each direction. What is the boat's rate in still water?