Question 78729
{{{Slope=(Rise)/(Run)=(deltay/deltax)}}}
Be Sure to use the same units for the calculation.
1 mile=5280 feet
{{{Slope=((1800/5280)/3.25)}}}
{{{Slope=0.1048}}}

I'll leave the rounding to you :-)

Good Luck,
tutor_paul@yahoo.com