A field is supplied with water by the drip irrigation system. If the number of basic units of the system is 6 units, 3 units are operated Of them daily, if you know that the perfusion interval is 2 days, the perfusion efficiency is 88%, the daily design transpiration of the plant is 11 mm per day, the distance between the drip tubes is 3.5 m, the distance between the droppers is 1.5 m, the energy slope is 0.07 and the length ratio is 0.004. 

Answer the following:

1- The time required to operate the system in one day is?

2- The punctate conjugation is?

3-The main drain pipe is?

4- The diameter of the main pipe is