You can put this solution on YOUR website! Walking 6/7th of his usual speed, a man is 12 minutes too late.
The usual time taken by him to cover that distance is?
:
Distance is directly related to speed, therefore at 6/7 the speed he will cover 6/7 the distance.
Therefore 1/7 the distance will required 12 min
:
To cover the whole distance: 7 * 12 = 84 min