So they need to drop it about 583 meters before they fly over
the mountain climbers. That's a little over half a kilometer.
No way they'll succeed!! It'll fall down in a valley. They'd
better get a helicopter instead of a plane.
Edwin
You can put this solution on YOUR website! Edwin doesn't understand helicopters.
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A helicopter wouldn't deliver stuff.
It would pick up the stranded people.
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PS All aircraft use knots as the unit of speed, and feet as altitude. Not kilometers.