Two planes leave new york kennedy airport at the same time. One flies east to paris, france at 550 miles per hour. The other flies west to tokyo, japan at 475 miles per hour. In how many hours will they be 6150 miles apart?

Solution:

The time is x

So

550x+475x = 6150

x = 6

So

They will be 6150 miles apart after 6 hours