book Maths Puzzle Numerical Ability

The orrigation system needs about 3 times as long to complete a job as another irrigation system. When both systems operate at the same time the job can be completed in 9 hrs. How

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A steel rod. 31 cm. long is to be cut into 3 parts, two of which parts are to be of equal lengths. The lengths of each of the 2 equal parts is 5 cm. more than the third part. Find their lengths. If f(x) = x2 + 5, find f(a + h) − f(a)