4 hours and 25 minutes total this is equal to 265 minutes (4 x 60 = 240, 240 + 25 = 265)
and 2 hours 48 in morning this is equal to 168 minutes (2 x 60 = 120, 120 + 48 = 168)
you do total minutes - morning minutes , So:
265- 168 = 97 minutes
97 minutes is the same as 1 hour and 37 minutes