The answer is 8/5.
When multiplying fractions you multiply the top numbers (Numerators) and then the bottom numbers (Denominators).
4 * 6 = 24, 3 * 5 = 15. So we have 24/15. We can simplify this since both 24 and 15 are divisible by 3. Divide both the top and bottom number by 3 to get 24/15 = 8/5.