Here's how I did mines : A= number of hours , B= Number of miles , C= distance travel . so ;A =12 , B = 36 , 36 divided by 12 = 3 mph. then, remember the question states his son goes at twice as fast as his dad rate of speed so I multiply 3 times 2 = 6 . then I multiply 6 times 9 = 54 miles
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