8. Several dump trucks, standing in a queue, are loaded one by one at point A (the loading time is the same for all trucks) and transport the cargo to point B, where they are instantly unloaded and return to A. The speeds of the trucks are the same, and the speed of a loaded truck is 6/7 of the speed of an empty truck. The first driver to leave A was Petrov. On his way back, he met driver Ivanov, who left A last, and arrived at A 6 minutes after the meeting. Here, Petrov immediately started loading, and after the loading was completed, he left for point B and met Ivanov a second time 40 minutes after the first meeting. From the place of the second meeting, it took Ivanov no less than **16** minutes but no more than 19 minutes to reach A. Determine the loading time and the number of trucks being loaded.
Answer: loading time - 13, number of loaded trucks - 5.

Criteria for determining winners and prize winners of the final stage of the 2013-14 academic year

Maximum for each task - 3 points

1st place: no less than 23 points;

2nd place: no less than 6 fully solved tasks or no less than 19 points;

3rd place: no less than 5 fully solved tasks or no less than 15 points.