The file, 90 megabytes in size, downloads at the rate of 5 megabytes per second for its first 60 megabytes, and then 10 megabytes per second thereafter. How long, in seconds, does it take to download entirely?
The first 60 megabytes take 60/5=<<60/5=12>>12 seconds.
There are 90-60=<<90-60=30>>30 remaining megabytes.
The remaining 30 megabytes take 30/10=<<30/10=3>>3 seconds.
And 12+3=<<12+3=15>>15 seconds.
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