A tourist is traveling by car due east on a road through a forest. From point A on the road, a path heads due northeast to an observationtower. The tower is 4mi from A, and a ranger in the tower can see for a distance of 3.5mi. For what length of the road can the ranger see the tourist's car?

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A tourist is traveling by car due east on a road through a forest. From point A on the road, a path heads due northeast to an observationtower. The tower is 4mi from A, and a ranger in the tower can see for a distance of 3.5mi. For what length of the road can the ranger see the tourist's car? 

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