Hi there!
3/4 is bigger than 3/2 so we would subtract it...
But the thing is the denominator of both fractions is inequivalent. This means that we would multiply 3/2 into a denominator...
[tex]\frac{3}{2}=\frac{6}{4}[/tex]
Subtract both terms:
[tex]\frac{6}{4}- \frac{3}{4}=\frac{3}{4}[/tex]
Distance: 3/4