Answer
$$\left(0.35,\:-6\right)$$
Work Step by Step
Using the distance formula, we find:
$$\sqrt{\left(3.1-\left(-2.4\right)\right)^2+\left(-5.3-\left(-6.7\right)\right)^2}\\ 5.675$$
Using the midpoint formula, we find:
$$\left(\frac{3.1-2.4}{2},\:\frac{-5.3-6.7}{2}\right)\\ \left(0.35,\:-6\right)$$