exam Maths Puzzle Numerical Ability

If the sides of a square are decreased by 2cm, the area is decreased by 36cm^2(1296cm). What were the dimensions of the original square?

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exam Other Question

A plane flies 300 miles with a tail wind in 1 hour. It takes the same plane 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air? Please help me with this problem (show your work)

( 7 x 10^3) x (8 x 10 ^-9)