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The Robinson family and the Moore family each used their sprinklers last summer. The water output rate for the Robinson family's sprinkler was 40 L per hour. The water output rate for the Moore family's sprinkler was 15 L per hour. The families used their sprinklers for a combined total of 60 hours, resulting in a total water output of 1400 L. How long was each sprinkler used?
Sagot :
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