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is rising at this instant. 8 Two jet aeroplanes fly on parallel courses which are 12 km apart. Their air speeds are 200 ms- and

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is rising at this instant. 8 Two jet aeroplanes fly on parallel courses which are 12 km apart. Their air speeds are 200 ms- and 250 ms . How fast is the distance between them changing at the instant when the slower jet is 5 km ahead of the faster one

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