Question 984617

The water flow-rate through the pipe is the product of the pipe's cross-sectional area and the velocity of the water flow:


flow-rate = product of the pipe's cross-section area and the velocity of the water flow = 50 {{{cm^2}}} * 25 {{{cm/s}}} = 1250 {{{cm^3/s}}}. 


Tank volume = 1 m * 0.8 m * 0.2 m = 100 cm* 80 cm * 20 cm = 160000 {{{cm^3}}}. 


The time required to fill the tank = {{{tank_volume/flow-rate}}} = {{{160000/1250}}} = 128 sec.