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A 6 foot tall man is walking at a rate of 4i] metres per minute directly away,r from a wall with a strong light mounted

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A 6 foot tall man is walking at a rate of 4i] metres per minute directly away,r from a wall with a strong light mounted on it. When he is 10 metres from the wall, he casts a shadow 20 metres long. At what rate is the length of his shadow increasing when he is 30 metres from the wall

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