On Monday, students at a summer camp spent 4 hours and 25 minutes learning how to swim. In the morning they spent 2 hours and 48 minutes at the pool. How long did the students spend at the pool in the afternoon?

6 hours and 13 minutes

because when you add it that is what you get

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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