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The angle of elevation of the top P of a tower from the feet of one person standing due south of the tower is 45º and from the feet of another person standing due west of the tower is 30º. If the height of the tower is 5 meters, then the distance (in meters) between the two persons is equal to

1. 5 2 5
2. 10
3. 5
4. 5 5

Correct answer: 10

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