It was used to see how your basic math skills
The answer si that the first ten odd integers are all even. Maybe this is really a fact but not a conjecture
The protractor measures angles that open from left or from the right
The total travelled for the first five hours eould be 450 km and divided by three leaves 150 km per 1/5 of his journey. travelling at 75 km per hour, it would take 4 hours to get through the remaining 300 km for him trip leaving a total time of 9 hours of traveling
