Question

you want to download a file from the internet . the size of the file is 800MB . if you download 520MB in 390 sec then in how much time will the full file get downloaded

Answer 1

speed per second= 520/390
=1.33 mb/s (approx.)

Time taken to download 800mb= 800/1.33
=600 seconds(approx.)

Answer 2

$(520 \div 390) = 1.3333333 \\ 800/1.3333333=600.000015$
600.000015 sec are taken approximately