How long does it take a message to travel from earth to a spacecraft at mars at its farthest from earth (about 400 million km) ? express your answer to three significant figures and include the appropriate units. t = ?

A message needs to be traveled to mars from earth. Distance between Earth and Mars (given) s = 400 million km

Speed of light = 3.00-10^5 km / sec

We know Velocity = distance / time = > time = distance / velocity

Time taken t = 400 million km / 3.00-10^5 = 400 x 10^6 / 3 x 10^5 = 1333.3 sec Time taken t = 22 min