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An army pilot flying an aeroplane at an ...

An army pilot flying an aeroplane at an altitude of 1800 m observes two ships sailing towards it in the same direction and immediately reports it to the navy chief. The angle of depression of the ships as observed from the aeroplane is `60^(@)` and `30^(@)` respectively.
[a] Find the distance between two ships.
[b] What value has the pilot shown?

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