Hi.. I would like to know if you are familiair with the next problem:

2 poles are set up in an alley. one pole is 5 metres, the other 4

like this:

]       [
]       [
]      /[
]\    / [
] \  /  [
]   /   [
]  / \  [
] /   \ [
]/_____\[

the hight at witch they cross each other is 3 metres..

Q: what is the width of the alley??

This has been puzzling me for 3 months now, and I'm starting to get very desperate.. (sick of it actually..) Nobody seems to know the answer (not numerical obtained) Could you help me with this??

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