Sal has already finished five nights of the 45 math problems he was assigned if each math problem took him three fifths 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 a. 45* 5/9 *3/5b. 45* 5/9 divided by 3/5 c. 45 * 4/9 * 3/5 d.45 * 4/9 / 3/5