Question

a man stands 10m in front of a large plane mirror. how far must he walk before he is 5m away from his image?

Answer 1

Answer:

7.5 m towards the mirror.

Explanation:

distance between mirror and the man = distance between mirror and his image.

so his distance from his image will be = twice the distance between him and the mirror. so in this case, if he has to be 5m away from his image, he has got to be 2.5 m away from the mirror. Since, he is 10m away from the mirror now, to be 2.5 meter away from the mirror he has to walk 7.5 m towards the mirror.(10-2.5=7.5)

Hope it helps. Have a nice day:)