if Kalle eats 1 watermelon in 3 hours and Malin eats 1 watermelon in 6 hours and Joham eats 1 watermelon in 5 hours. If they all eat from the same watermelon, how much will they be able to eat in 1 hour_
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Kalle eats 1/3 in one hour, Malin 1/6, and Joham 1/5
So (1/3) + (1/6) + (1/5) = 10/30 + 5/30 + 6/30 = 21/30 = 7/10 of a watermelon in one hour