Re: riddling day for donkeys.
Wait wait wait... I got it!
First, the 1 and 2 guys go and the 1 guy comes back. That's 2+1=3 minutes.
Next, send the 5 and 10 guys! Bring the 2 guy back. That's another 10+2=12 minutes. Total = 3+12=15 minutes.
Finally, you just need to bring the 1 and 2 guys back across. 2 minutes for a total of 15+2=17 minutes!
I win!
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