







Water flowing through a rectangular drain 
20160108 

Tiffany pose la question : the cross section of drain is a rectangle 30 cm wide. If water 3.5 cm deep flows through the drain at a rate of 22 cm/s, how many litres of water will flow through in one minute? Penny Nom lui répond. 





A pipe in a ditch 
20110519 

Jim pose la question : How many cubic feet of stone will it take to fill to six inches around a 4 inch pipe in a ditch 128 ft long x 20 in wide? Penny Nom lui répond. 





Comparing flow rates of two pipes 
20070714 

Kenneth pose la question : If two water pipes are 3 feet long, but one of them has a 1 foot diameter and the second has a 1 1/2 foot diameter, what simple mathematical method can be used to determine how much faster one pipe can drain water than the other pipe? Stephen La Rocque lui répond. 





Two rate problems 
20020930 

Rebecca pose la question :
 There are two small holes in the bottom of a tub filled with water. If opened, one hole will empty the tub in three hours; the other will empty it in six hours. If both holes are opened at the same time, how long will it take to empty the tub?
 An airplane flies 400 miles per hour in calm air. It can cover 900 miles flying with the wind in the same time that it can cover 700 miles against the wind. What is the speed of the wind?
Penny Nom lui répond. 

