Mathematics, 23.10.2019 02:00, Derienw6586

The chang family and the davis family each used their sprinklers last summer. the water output rate for the chang family's sprinkler was 15 l per hour. the water output rate for the davis family's sprinkler was 40 l per hour. the families used their sprinklers for a combined total of 60 hours, resulting in a total water output of 1775 l. how long was each sprinkler used?

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The chang family and the davis family each used their sprinklers last summer. the water output rate...