Question: At a given instant, the position of a plane at A and a train at B are measured relative to a radar antenna at O.

At a given instant, the position of a plane at A and a train at B are measured relative to a radar antenna at O. Determine the distance d between A and B at this instant. To solve the problem, formulate a position vector, directed from A to B, and then determine itsmagnitude.

5 km 60 40 25 2 km

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