A group of hikers is to travelxkm by bus at an average speed of 48 km/h to an unknown destination. They then plan to walk back along the same route at an average speed of 4.8 km/h and to arrive back 24 hours after setting out in the bus. If they allow 2 hours for lunch and rest, how far must the bus take them?

I am unsure what to do with question, do I have to set up a simultaneous equation or...

Any help would be greatly appreciated!