Mathematics, 02.06.2021 14:00 natimike10

Sara can weed a garden in 30 minutes. When her brother Hamdan helps her, they can weed the same garden in 20 minutes. How long would it take Hamdan to weed the garden if he
worked by himself?

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Sara can weed a garden in 30 minutes. When her brother Hamdan helps her, they can weed the same gar...

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