difference between the download speed and internet speed?

Are you sure you're not getting 190-200KBps? You have to watch because the speed is often stated using different bit rates. When you see 1.5Mbs (lower case b) then it is megabits per second. If you see 190KBs (upper case B) then it's talking kilobytes per second. There are 8 bits in a byte so you really need to multiply the KBs number by 8 to determine the megabits or divide the Mbs number by 8 to determine the megabyte number.

In your case 200KBs multiplied by 8 is 1600Kbs or 1.6Mbs.

Firstly the advertised rate is normally a maximum, not an actual rate - An advertised rate of 10 meg will often provide far less than this, indeed it will normally be sold as "Up to" 10Mb/s.

Second, The advertised rate is in often in Megabits/Second whilst the download speed is quoted in MegaBytes/second - as there are 8 bits in a byte, the download speed will often show as one eighth of the internet speed

Either or both of these could be responsible for your results

You are also dependent on the general traffic on the net and the speed (or possible congestion) of the server from where you download. I myself have also seen great varietions.