What happens if you use two effects/features that push a target away?

Like say using a Battlemaster’s pushing maneuver as well as a Swords bard’s Mobile Flourish on a single creature. Does it push the creature a minimum of 20 feet away from you, stacking both effects, or does it only push the creature the farthest distance of the two? (15 feet in this case, or 17 feet if you have a d12 inspiration)