Mathematics, 07.09.2021 14:00, dertydee

Two hoses from two different taps are used to fill a fishpond. The first hose alone takes 20 minutes to fill the fishpond. The second hose alone takes 30 minutes to
fill the fishpond. How long would it take to fill the fishpond if both hoses are used?

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Two hoses from two different taps are used to fill a fishpond. The first hose alone takes 20 minut...