exam Maths Puzzle Numerical Ability

A park has two sprinkers that are used to fill a fountain.One sprinker can fill the fountain in 3 hours and the second sprinker can fill the fountain in 6 hours. How long will it take to fill the fountain with both sprinkers operating.

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exam Other Question
how do u do this 10 to the negative 2nd power? How long must a guywire be to run from the top of a 18ft pole to a point on the ground 12 feet away?

Have have not a clue.