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| 1. |
Q: An observer on the top of a mountain, 500 m above the sea level, observes the angles of depression of the two boats in his same place vision to be 45 ° and 30 ° respectively. Then the distance between the boats, if the boats are on the same side of the mountain, is |
| A. | 366 m |
| B. | 699 m |
| C. | 456 m |
| D. | 584 m |
| Answer» B. 699 m | |