What it all comes down to is one of two questions;
1) If you're paddling a two way canoe down a one way river and your saddle falls off, how many waffles will it take to shingle your doghouse?
or
2) If a train carrying 800,000 gallons of gravy left Moose Jaw at 10am, and a tanker truck carrying another 100,000 gallons of gravy left Winnipeg at 6am, how many tons of potatoes would we need in Moosomin by 2pm?
Believe it or not... I actually worked out an answer for #2 once.