Example 1: Given that: Starting time, ST = 6 a.m. Finishing time, FT =10 a.m. To find: Elapsed time So, ELASPED TIME = FT – ST = (10 – 6) a.m. = 4 hours ✓ If one time is in a.m. and other is p.m. , convert to 24-hour clock and then solve.