Can anyone explain Couch to 5K week 2 please?

MikeyMikey ✭✭✭
Hi, I'm returning to running after a gap of some 10 years or so and thought I'd start with Couch to 5k.
I've done the first week and my next run will be from week2.

What puzzles me is that they say "you will alternate 90 seconds of running, with 2 minutes of walking, for a total of 20 minutes".

It's not a big deal but I can't make any combination of 90 seconds running and 2 minutes of walking make 20 minutes 
  • 5 repeats makes a total of 17.5 minutes
  • 6 repeats makes a total of 21 minutes
The only way that I can get it to be 20 minutes is if I make the final walk 1 minute long. Is this a typo? I know that the differences are probably unimportant but I'm curious as to whether I'm missing something :D



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