dog vs the intarnet

[catpants]

A friend posed me this question:

Imagine that you have trained your dog to carry a box of three 8-mm tapes. These tapes each contain 7 GB of data. Your dog can travel to your side, whereever you may be, at 18 km/hr. For what range of distances does your dog have a higher data rate than a transmission line whose data rate is 150 Mbps?

I worked it out and got 5.6km. Can anyone confirm/refute this?

 

[JRock]

We do networking over here not math. You just made my head hurt. Now go fetch me a beer doggie

 

[Fardringle]

Your distance number is close, but a little off if I'm doing the math right...

The dog can carry 21,504MB (21GB*1024MB/GB) at a rate of 18KM/hr.
The 150Mbps (18.75MB/s) line will take 1146.88 seconds, or .3186 hours, to transmit that same 21GB (21504MB/18.75MB/s).
The dog can carry its 21GB 'payload' 5.7348KM in .3186 hours (18KM/hr*.3186hr).

 

[catpants]

That looks to be about what I did, except that I took the gigabyte to be 10^9 bytes (so 21GB*8 = 168Gb@18kph). That should account for the variation. I'm glad to see I was doing it right, my friend got something like 17000km or so...