File size download speed conversion

    • 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!

    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)
Write a reply… Reply
Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: October 13, 2016
TSR Support Team
What is stopping you from being in a happy relationship?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.