1. If the walking speed ratio of Party A and Party B is 5:6, then the time ratio of two people walking the same distance is (6:5).

2. In the 100-meter race, running speed is inversely proportional to running time.

3. The total amount of coal is fixed, and the amount of coal burned every day is inversely proportional to the number of days of burning.

4. A cuboid has a certain volume, and its bottom area is inversely proportional to its height.

5. When the driving distance is constant, the circumference of the wheel is directly proportional to the number of revolutions.

Application questions:

72 ╳ 0.8 ╳ 0.8 ÷ (0.6 ╳ 0.6) =1281(block)

2. (1-5/7) ÷ (5/7 ÷ 3) = 2/7 ÷ 5/21=1.2 (days)