exam Maths Puzzle Numerical Ability

if I have the height and volume of a cylinder, how do I find the radius? or diameter?

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exam Other Question

Solve by completing the square

x^2 + 2 = 2x
please help me solve this problem in quadratic equation;
1.a motorboat takes 4 hours to travel 30 miles downstream and then 18 miles upstream on a river whose current flows at the rate of 3 miles per hour. How fast can the boat travel in still water?