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Question

The Mitchell family and the Jenkins family each used their sprinklers last summer. The water output rate for the Mitchell family's sprinkler was 

30L

 per hour. The water output rate for the Jenkins family's sprinkler was 

20L

 per hour. The families used their sprinklers for a combined total of 

35

 hours, resulting in a total water output of 

900L

. How long was each sprinkler used? 

 Jun 3, 2020
 #1
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+1

30 x    +  20 (35-x) = 900         solve for 'x' the 30L sprinkler hours    then  35-x = 20L hours

 Jun 3, 2020

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