How fast is 27mhz for RC cars?

27 megahertz is a rate of 27 million cycles every second. Usually any form of RF-controlled device, such as RC cars use a wide variety of different frequencies to prevent interference. Take for example, most cordless phones nowadays operate on a 2.4GHz band (where previous ones used 900MHz roughly before 2004) which competes with devices that are compliant with every IEEE wireless networking standard up to 802.11ac (which operates on a 5GHz band).