exam Maths Puzzle Numerical Ability

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

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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 Pump A can unload a tanker in 15 hours, Pump B can unload the same tanker in 25 hours. Because of an approaching storm, both pumps are used to empty the tanker. If the pumps begin at 2:30 a.m., what time will the job be complete?