exam Maths Puzzle Numerical Ability

complex fractions

9x^2-16y^2 over xy over 3 overy-4 over x

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exam Other Question

A paddleboat can travel 60 miles upstream in the same time it takes to travel 140 miles downstream. If the current of the river is 10 miles per hour, what is the speed of the paddleboat in still water? Solve by the elimination method.

3x-2y=22
5x+4y=0
What is the solution of the system? _______ answer should be an ordered pair