book Maths Puzzle Numerical Ability

A boat that can travel 8 miles per hour in still water can travel 15 miles w with the water's current in the same time that it can travel 9 miles against the water's current. What

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Find an equation of the line passing through the two points. Write the equation in standard form. (8,2) and (3,6) What size square can be inscribed in a circle of radius 8 inches. I am assuming to use pythagoran theorem which I know 8^2 will probably be the c^2 but I'm not sure how to figure o