Question

20 h 7 min 30 s - 12 h 15 min 42 s​

Answer 1

Step-by-step explanation:

20hr 7 mins 30 sec = 20×60×60 + 7 × 60 + 30 = 72,450 sec

12 h 15 min 42 sec = 12×60×60 + 15 × 60 + 42 = 44,142 sec

now ,

72450 - 44,142 = 28,308 sec

28303 sec = 7 hr 51 min 48 sec