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18. A school cleaned up the banks of several nearby waters. In all,
11 miles of Silver Stream, 13 miles of Broken Brook, and 22 miles
of Crooked Creek were cleaned. It took 35 minutes per mile for
Silver Stream; 45 minutes per mile for Broken Brook, and 25
minutes per mile for Crooked Creek. Organize the information
using matrices. Then use matrix multiplication to find the total
amount of time spent cleaning nearby waters last year.



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