A man stands 10 m in front of a large plane mirror. How far must he walk before he is 5 m away from his
image ?
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Initially, the distance between the man and the mirror is 10m. Distance between the man and his image is 5 m when the man is 2.5 m away from the mirror. Therefore, he has to walk 10 m - 2.5m = 7.5 m towards the mirror.
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