A horizontal 15mm diameter and 200-meter-long water pipe supplies irrigation water to a farm from a water reservoir tank. The water tank is kept at a gage pressure of 250kPa. How many cubic meters per hour of water is being supplied to the farm by this line. i. (State clearly all assumptions you need to make to solve this problem.) ii. (Present your work in a clear manner, showing all steps you make in solving the problem.)