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"After travelling the first 500 kilometres of a 1000 kilometre flight at an average speed of 500 kilometres an hour, how fast must a plane fly for the remaining 500 kilometres for its average speed for the whole trip to be 1000 kilometers an hour?"
Obviously there's a bunch of ways to phrase this basic problem but the basic solution - the plane should be there by now - is the constant
so in other words, you Guessed The Teacher's Password
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