When Xiao Qiang walked 40 kilometers, Xiao Ming walked a third of the whole journey, so when Xiao Qiang walked 60 kilometers, Xiao Ming should be able to walk half of the whole journey, that is to say, when Xiao Qiang walked 100 kilometers, Xiao Ming walked a third plus half, that is, six fifths. When they met, that is to say, one sixth of the whole journey was 6500.

The formula is: (40+60)/(1-1/3-60/40×1/3) = 600.

2. Formula of metal cone altimeter: 3.14× 20×1.5/(3.14×10/3) =18cm.

The height of the metal cone is18cm.

3. Find out how many trees are among the three kinds of trees:

144/(40/100+40/100× 7/8+40/100-1) = 960, then

Fir: 960×40/ 100=384, cypress: 384×7/8=336, buttonwood: 384- 144=240.

4. According to the topic, the ratio of class A to the sum of the two classes is 5:9. If two people are transferred from class A to class B, the ratio of class A to the sum of the two classes is 8: 15.

First of all, the sum of the number of students in the two classes is: 2/(5/9-8/ 15)=90, so the number of students in Class A is 90×5/9=50, and the number of students in Class B is 90-50=40.

5. Because it took * * * 16 days to complete the project, Party A completed 16/20 in16 days, and Party B completed the rest, and Party B completed130 every day, so that we can know how many days Party B worked and rested. The calculation formula is as follows:

6. After two fifths of pile A is transported away, the original three fifths is 20 tons less than that after two fifths of pile B is transported to seven fifths. Because both piles of coal are ***300 tons, the coal quantity of pile A is calculated as follows:

(300×7/5-20)/(7/5+3/5)=200 tons, and the amount of coal in pile B is 300-200= 100 tons.