Let's take a look at the equation.
[tex] \frac{3}{4} [/tex]× [tex] \frac{5}{7} [/tex]
Now, all you would have to do is solve it.
[tex] \frac{3}{4} [/tex]× [tex] \frac{5}{7} [/tex] = [tex] \frac{15}{28} [/tex] (can't be reduced any further)
Your answer would be [tex] \frac{15}{28} [/tex].
I hope this helps!