SOLUTION: Norma can row her boat 12 miles in the same time as it takes Marietta to cover 36 miles in her motorboat. If Marietta's boat travels 15 mph faster than Norma's boat, then how fast

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Question 424761: Norma can row her boat 12 miles in the same time as it takes Marietta to cover 36 miles in her motorboat. If Marietta's boat travels 15 mph faster than Norma's boat, then how fast is Norma rowing her boat?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Norma x mph
Marietta 15 faster

Norma 12 miles
Marietta 36 miles
....
Norma time =Marietta time

12/x=36/ (x+15)
cross multiply
12(x+15) =36x
12x+180 =36x
36x-12x =180
24x=180
/24
x=7 1/ 2mph Norma speed