exam Maths Puzzle Numerical Ability

Write three quadratic equations, with a, b, and c (coefficients of x2, x, and the constant) as:
1. Integers
2. Rational numbers
3. Irrational numbers

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im not exactly sure on how to factor the denominators in this problem. A man rows 16 km upstream and back in 9 hours. He can row 1 km upstream in the same time that he can row 4 km downstream. Find the speedof the boat in still water and the speed of