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Well, you could fill 1 4L beaker, or 4 1L beakers, or 8 500mL beakers, or 16 250mL beakers ...
42
20
2
F1 fills one-eighth per minute, F1 & F2 together fill one-fifth per minute, so F2 is responsible for one-fifth less one-eighth ie three-fortieths per minute so F2 alone would take 40/3 ie 13 min 20 sec.