Together
Grandfather, father, and son are carpenters. They decided to make a wardrobe.
Father produces it for 12 hours, his son for 15 hours, and grandfather for 10 hours.
How long will they make it together?
Father produces it for 12 hours, his son for 15 hours, and grandfather for 10 hours.
How long will they make it together?
Correct answer:
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