Milla and Luka are 3 kilometers apart and walking toward each other. Milla's average speed is 5 kilometers per hour and Luka's is 4 kilometers per hour. A table showing Rate in kilometers per hour, Time in hours, and Distance in kilometers. The first row shows, Milla, and has 5, t, and 5 t. The second row shows, Luka, and has 4, t, and 4 t.
Which equation can be used to find t, the time it takes for Milla and Luka to meet?

5t + 4t = 1
5t + 4t = 3
5t – 4t = 0
5t – 4t = 3