Mathematics, 04.03.2021 18:20 sum72

The Richardson family and the Choi family each used their sprinklers last summer. The water output rate for the Richardson family's sprinkler was 40L per hour. The water output rate for the Choi family's sprinkler was 15L per hour. The families used their sprinklers for a combined total of 55 hours, resulting in a total water output of 1575L. How long was each sprinkler used?

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The Richardson family and the Choi family each used their sprinklers last summer. The water output r...