book Maths Puzzle Numerical Ability

Find the roots of the quadratic equations by the method of completing the square. Express the roots, if they are not rational, in simplest radical form.

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I need help with these two problems please help me.

The Greater of two consecutive integers is 15 more than twice the smaller. Find the integers. It takes 10 hours to fill a pool with water, and 20 hours to drain it. If the pool is empty and the drain is open, how long will it take to fill the pool?