When looking at remote control vehicles, 27 mhz and 49 mhz are the radio frequencies, right?

If I had 27 and 42 could they could race without interfering with each other?

We've never been able to race two of our toys together because one remote will control both cars/boats/trucks.

Do you guys recommend any reasonably priced Monster trucks or race cars? There are so many out there. We're still a little young and rough on them to go high end.