There are several options, including paying someone to drive your car there, and transporting it on the Shozoloza Meyl passenger train service by rail. The safest solution is to use a professional car carrier company such as Motorvia, or exclusive-carriersdotcodotza.
I have given you a link to the rail service company and you can Google the others.
Swahili isn't an official language in Johannesburg, but it would be spoken by Kenyan people living in Johannesburg.
Nairobi is closer to the equator than Johannesburg.
That would be impossible to say as there are millions of informal houses in and around Johannesburg which would not form part of an official count.
The stats for this would not exist, because there are many illegal immigrants from Nigeria in Johannesburg.
It would depend on which part of the USA, from Johannesburg to New York it is about a 20-hour flight.
The search for water route to Asia was for a faster transportation route. The Silk Road had two main trails, a northern route and a southern route. Transporting goods along either of the routes was dangerous and took a long time. Only limited quantities of goods could be traded using this transportation method. A sea route would allow the goods to be transported more quickly and at higher quantities.
Santiago is about 9 129 kilometres from Johannesburg and it would take about 12 hours to fly it.
South Africa
Johannesburg is approximately 600km from Durban, so the drive would take between 5 to 6 hours.
A Greyhound ticket from Johannesburg to Bloemfontein would cost about 300 euros. It all depends though on the date and time you want to leave.
That would depend on where in the UK.
A flight would be about 6 hours.