The first file will take 80/2= <<80/2=40>>40 minutes to download.
The second file will take 90/2= <<90/2=45>>45 minutes to download.
And the third file will take 70/2= <<70/2=35>>35 minutes to download.
So, it will take 40 + 45 + 35 =<<40+45+35=120>>120 minutes for all the files to download.
Therefore, the total hours she will have to spend to download all the files is 120/60= <<120/60=2>>2 hours.
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