Mathematics, 02.02.2020 20:43, olgapagan1010

The griffin family and gray family each used their sprinklers last year . the water output rate for the griffin family's sprinkler was 30 l per hour. the water output rate for the grays family's sprinkler was 40 l per hour. the family's used their sprinkler for a combined total of 55 hours resulting in a total water output of 1950 l. how long was each sprinkler used?

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The griffin family and gray family each used their sprinklers last year . the water output rate for...