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Answer: 10.5 miles
The mall is 15 mi. from your home, so the school is 15/2=7.5 mi. from your home. The library is 2/5 of the way from your school to the mall.15-7.5=7.5, and 7.5*2/5 is 3. 7.5+3=10.5.
So, I think it's 10.5 mi.
