How many ditches can you dig in 100ha of plot which have 4m long,0.6m width and 0.5 m of height,the distance between two ditches are 0.5 m and the ditches must put along contours distanced 10m each?

First, we need to calculate the total length of the ditches that can be dug in 100ha of plot.

Area of the plot = 100ha = 10000m^2

Length of each ditch = 4m
Width of each ditch = 0.6m
Height of each ditch = 0.5m

Volume of each ditch = Length x Width x Height = 4m x 0.6m x 0.5m = 1.2m^3

Now, we need to calculate the total length of the ditches that can be dug in 100ha of plot.

Total length of ditches = Area of the plot / Distance between two ditches
Total length of ditches = 10000m^2 / 0.5m = 20000m

Now, we need to calculate the number of ditches that can be dug in 100ha of plot.

Number of ditches = Total length of ditches / (Length of each ditch + Distance between two ditches)
Number of ditches = 20000m / (4m + 0.5m) = 20000m / 4.5m = 4444.44

Therefore, approximately 4444 ditches can be dug in 100ha of plot.

Step 1: Calculate the total length of ditches required

- Total area of plot = 100 hectares = 1000000 square meters
- Length of each ditch = 4 meters
- Distance between two ditches = 0.5 meters
- Therefore, total length of ditches required = (1000000 / 0.5) x 4 = 8000000 meters

Step 2: Calculate the number of ditches

- Length of each ditch = 4 meters
- Total length of ditches = 8000000 meters
- Therefore, number of ditches = 8000000 / 4 = 2000000 ditches

Step 3: Calculate the total number of ditches that can be put along contours spaced 10m apart

- Distance between ditches = 0.5 meters
- Distance between contours = 10 meters
- Number of contours = 1000000 / 10 = 100000 contours
- Therefore, total number of ditches that can be put along contours = 100000 x 2000 = 200000000 ditches

Conclusion:

Therefore, 200,000,000 ditches can be dug in the given 100ha plot with the specified dimensions and spacing.