A man travelled a distance of 8km in an hour. How long will it take him to cover a distance of 12km, travelling at the same speed

In the first hour, the man travelled 8km. To cover a distance of 12km, he would need to travel 4km more than he did in the first hour.

Since he travels at a constant speed, it will take him 1/3 of an hour to travel 4km.

Therefore, it will take him 1 hour and 20 minutes to cover a distance of 12km.