exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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. Add or subtract as indicated. Be sure to simply completely.

2/5w+10 minus 3/2w-4

I do not know how to get the denominators to become the same. I am begging someone for help, please!