Question

a boy is running towards a plane mirror with velocity v then with what speed will its image run

Answer 1

a 
The mirror image is travelling in the opposite direction to the running boy. but it appears to be moving at the same speed 
Say the running boy is moving at 10 feet per second and he is 20 feet from the mirror. He will hit the mirror in 2 seconds 
The image in the mirror will appear to move from the equivalent of 20 feet back to reach the mirror glass also in 2 seconds Their speeds appear identical but of course the vectors are reversed.

Answer 2

$v \div time$
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