Bill started walking with a speed of X miles per hour

Bill started walking with a speed of X miles per hour. Will he cover more than 16 miles in the next 8 hours ? 1. In 2 hours he will cover 4 miles. 2. In 5 hours he will covers at most 10 miles. I have two specific queries. A. In case of time-speed-distance(TSD) problems is it mandatory to have avera...