Respuesta :

.79 km/s * 1miles/.62 km * 3600 seconds/hour = 4587.1 Miles per hour.
so you're basically going to use the whole 1/0.62=x/7.9 thing, and you get a really long number answer that I summed up as 4.9. If you aren't supposed to sum it up, then... just tell me and i'll figure out the rest.