The South African born entrepreneur, Elon Musk, is planning to launch a spacecraft that will land on Mars sometime in the future. His company, SpaceX, wants to build a permanent human settlement on Mars. The first human colony on the red planet will live inside domes. Assuming that Mars is about 266 666 667 km from Earth, how long would it take, in days, for a spacecraft to reach Mars travelling at a speed of 28 500 km/h?
