Question

Roberto is downloading a large file from the Internet, and for the first minute of the download, the download speed was 600 kb per second. In each subsequent minute, the download speed has been only 40% of what it was the previous minute. If the file has been downloading for a total of 4 minutes, what has been the average download speed in kb per second?

Answer 1

Start 600
1st Minute 240
2nd Minute 96
3rd Minute 38.4
4th Minute 15.36

Answer 2

Minute 1: 600

Minute 2: 240

Minute 3: 96

Minute 4: 38.4

600+240+96+38.4=974.4/4

243.6

Answer: 243.6 kb per second