A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 9.75 multiplied by?

A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 9.75 multiplied by 107 km. Radio waves travel at the speed of light (3.00 multiplied by 108 m/s). How many seconds does it take for the signal to reach the Earth?