Both radio and light waves travel at the same speed, which is 260,000 miles per second. Light waves are visible and radio waves are invisible. We detect light waves by sight and we detect radio waves by sound.
Both radio waves and light are kinds of electromagnetic waves. The difference is in their wavelength. Radio waves have the wavelength in the range, let us say, kilometers (even to 100000 km) to millimeters (microwaves). Light refers typically to the spectral region of about 380-750 nm, visible light only approximately 400-700 nm.