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So, my dad told me this little problem quite a few years ago (when I was 8 or so...took me years to figure out how to solve it). It has always stuck with me because of that...so it's just a straightforward math problem, but it's a fun one:

There is an alley. In this alley there is a 20ft ladder and a 30ft ladder. These ladders cross over the alley from the ground to the opposite building. They cross each other 10ft above the ground. How wide is the alley?

Here's a simple drawing to represent this problem:


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