Sal has already finished 5/9 of the 45 math problems he was assigned. If each math problem took him 3/5 of a minute to finish and this pace continues, which expression can be used to determine the amount of time it will take him to finish his remaining homework?

45 times 5/9 times 3/5

45 times 5/9 divided by 3/5

45 times 4/9 times 3/5

45 times 4/9 divided by 3/5

please answer fast its timed