Question

how much time has elapsed between 12:11:30 and 15:24:55

Answer 1

We'll 15-12 = 3 , 24-11 =13 , and 55-30 = 25 so 3:13:25

Answer 2

Time elapsed = Final time - initial time

= 15:24:55 - 12:11: 30

= 3:13: 25

or, 3 hours, 13 minutes and 25 seconds has been elapsed.