Posted by Miguel on .
Lee and garth left the library at the same time and walked in opposite directions. On the same street avenue lee averaged 3 miles per hour and garth averaged 3.5 miles per hour. How long did it take them to be 3.25 miles apart?

math 
drwls,
They separate at a rate of 6.5 mph. In 1/2 hour their separation is 3.25 miles.