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Two Navy helicopters A and B are flying ...

Two Navy helicopters A and B are flying over the bay of Bengal at same altitude from the sea level to search a missing boat. Pilots of both the helicopters sight the boat the same time while they are part 10 km from each other. If the distance of the boat from A is 6 km and if the line segment AB subtends `60^(@)` at the boat, find the distance of the boat from B.

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The correct Answer is:
a = `(3 - sqrt(73)` km
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