you don't have any units
... and Mars is more than a light-second away
A space probe on the surface of Mars sends a radio signal back to earth a t a distance of 8.66 x10*7 radio waves travel at a speed of light 3.00 x 10^8 . How many seconds does it take for it to reach earth
2 answers
8.66x10^7 km. (3.00x10^8 m/s