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File size download speed conversion Watch

    • Thread Starter

    I'm doing my first year of university at OU (week 2) and I was getting the file transfer question wrong.
    I've been trying to practice this and going on website's that calculate this for you (to check my answers) I found that I was around 20 seconds off.
    This is my working out:

    50MB being downloaded at 512Kb/s (time it would take to download)
    50MB x 2^20 = 52,428,800 bytes x 8 = 419,430,400 bits
    512Kb x 1000 = 512,000 bits (per second)
    419,430,400 / 512,000 = 819.2 seconds / 60 = 13.66 minutes --- tells me it should take 13.39 minutes

    Now is there a conversion between the .66 decimal on 13.66 that I'm not doing or is there something else entirely that I'm getting wrong?

    Thanks for any help!
    • TSR Group Staff

    I would say that your 1000 should be 1024:
    512Kb x 1024 = 524,288 bits (per second)

    This then gives 13.33 minutes as the final answer - a difference of 0.33 minutes (20 seconds)
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