



 
Hi Alexander, The volume of a cylinder cylinder is $\pi \; r^2 h$ where $r$ is the radius and $h$ is the height. Thus the volume of water that is lost through the leak is \[\pi \; \left(\frac{90}{2}\right)^2 \times 20 \mbox{ cubic centimeters.}\] There are 1000 cubic centimeters in a litre so how many litres is that? At 10 liters per hour how long will it take to lose that much water? Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 