Problems in which water is flowing via a canal/pipe into a field/tank

When a pipe, through which water is flowing out, is partially closed with a finger, the water stream coming out falls to a greater distance from the pipe. Why?

A farmer connects a pipe of internal diameter 20cm from a canal into a cylindrical tank in her field,which is 10m in diameter and 2m deep.If water flows through the pipe at the rate of 3km/h, in how much time will the tank be filled?

Most water flow in root occurs via apoplast as

Water is flowing through a cylindrical pipe of internal diameter 2 cm, into a cylinderical tank of base radius 40 cm, at the rate of 0.4 m per second. Determine the rise in level of water in the tank half an hour.

Problem of Water flow

Three pipes which has radius 1, 2, 3 can respectively are connected to a tank water flowing in that pipes is square of radius of that pipes respectively. If the thin-nest piepe fills a tank in 42 minutes. How much time will they take to fill that tanke together.