SPACEX हमें MARS पर कैसे लेके जायेगा? | How will Elon Musk of SpaceX take us to Mars

At its closet approach, the distance between the mars and the earth is found to be 60 million km. When the planets are at this closet distance, how long would it take to send a radio message from a space probe of mars to earth?

At the closest approach, the distance between Mars and Earth is found to be 58 million km . When planets are at this closest distance, how long would it take to send a radio message from a space probe of mars to earth?

How much time it will take for he solar radiation to reach Mars? (A) 10min (B) 12.6min (C) 15min (D) 14.8m

How long would it take a radio wave of frequency 6xx10^(3) sec^(-1) to travel from mars to the earth, a distance of 8xx10^(7)km ?