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suppose you're driving a car that uses 11 liters of fuel for every 100 km

11 liters per 100 km = 11,000 cm cubed per 10,000,000 cm
= 0.0011 cm cubed per cm

i.e. for every centimeter that the car inches forward, uh, i mean, centimeters forward, it needs 0.0011 cubic centimeters of fuel

if we need to give our car 0.0011 cubic centimeters of fuel every time it drives forward one centimeter, then a pipe with a cross-section of 0.0011 **square** centimeters would exactly do the trick, so long as the fuel inches forward exactly one centimeter every time the car does

i.e. fuel flows into the engine at the same speed that the car drives forward, and the pipe we're using to fuel the engine has a cross-sectional area of 0.0011 cm squared