Water comes out a 0.9 cm diameter tap on the 5th floor of a building (14.6 m above the ground). The pipe supplying this tap has a diameter of 4.8 cm when it is 2.5 m below the ground. a) When water comes out of the tap at 3.8 m/s, the difference in pressure between the water in the tap and the water in the pipe below the ground is ____kPa

b)If water comes out of the tap at 3.8 m/s, the tap will take ____ minutes to fill a drum of height 1m and diameter 0.42m.