Two trains leave towns 336 miles apart at the same time and travel toward each other. One train travels 10 my/h slower than the other. If they meet in 2 hours, what is the rate of each train?

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?