An aircraft has a minimum sink rate of \(1.5\ \text{m/s}\). If it starts gliding from an altitude of \(1800\) metres, what is its maximum endurance (loiter time) in minutes?
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For a gliding aircraft,
\[
\boxed{
\text{Maximum Endurance}
=
\frac{\text{Altitude}}{\text{Minimum Sink Rate}}.
}
\]
Minimum sink speed provides the longest time aloft.