exam Maths Puzzle Numerical Ability

the length of a rectangle is twice its width. if the perimeter is 60, find the dimensions of the rectangle.

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can you please show me the steps on soloving this problem and its solution thank you!

x^2+24x+63= a certain aircraft can fly 912 miles with the wind in 3 hours and travel the same distance against the wind in 8 hours. what is the speed of the wind.