LASA_startWorking

Given an integer h, an integer m, and an array of integers, of length n. n is the number of tasks someone has to get done, and h:m is the time it has to be done by (24 hour format. h=13 is 1:00, h=14 is 2:00, so on). The array of integers is how long it takes (in minutes) to get each task done. Find the latest time (in hours and minutes) someone has to start working in order to get their tasks done before the deadline. The start time may need to be on the previous day. (return in this form, 24hr format: HH:MM)