Radio signals travel at a rate of 3x10^8 meters per second. how many seconds would it take for a radio for a signal to travel from a satellite to the surface of earth if the satellite is orbiting at a height of 4.2x10^7 meters? (hint: time is distance divided by rate.) a. 1.26x10^16 seconds b. 1.26x10^15 seconds c. 1.4x10^1 seconds d. 1.4x10^-1 seconds