(8- 1)*5=35 meters
2. Because planting a tree every 5 meters can have 35/5=7 intervals.
The number of trees should be the interval number plus 1, so you can plant 7+ 1=8 trees.
3. 19 trees are planted in one row. There are two planting methods.
The first method is to plant the trees planted at both ends evenly in the middle, so there are 19+ 1=20 intervals, so the distance between each tree is 60/20=3 meters.
Method 2: If both ends are planted correctly and there are 19- 1= 18 intervals, then the tree spacing is 60/ 18 = 10/3m.
4. If both ends are planted, the required tree is 60/3+ 1=2 1.
5. When sawing into 6 segments on average, the interval is 6- 1=5 times, so the required time is 5*2= 10 minutes.
The length of each segment is 12/6 = 2m.
6. Actually, it only takes 12-1=11sections to walk the12 pole, so it takes 22/1= 2 minutes for each section, so the 40-minute interval is just walking.