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???? Strengthen your brain by making your daily life a math exercise that you will be able to solve ???? : https://hedacademy.fr Finally the problem about bathtubs! A faucet fills a bathtub in 15 minutes. Another faucet fills the same bathtub in 20 minutes; How long will they take to fill the bathtub if we turn them on together? Video plan 00:00 Challenge 01:07 Understanding combined work 02:27 Step-by-step resolution 07:56 2nd resolution with the formula 10:25 Another application of the formula