One hour is equal to 60 minutes so if you take 45 minutes away you are left with 15 minutes.
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75 minutes - 60 minutes = 15 minutes or 900 seconds or 1/4 hour.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
30 minutes equal half an hour.
It is 1 hour and 40 minutes
Minus 45 minutes.