book Maths Puzzle Numerical Ability

If a and b are distinct real numbers such that a-b and a^2-b^2 are rational, must a and b be rational?

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book Other Question

round 20.615 to the nearest tenth
Thank You please HELP!!!!!!!!! Two jets leave the same airfield at the same time, traveling in opposite directions. One jet travels 80 miles faster than the other. In 8 hours the planes are 7200 miles apart. What is the speed of each plane?