GeneralSolvesv1

Cross the bridge in 17 minutes

The two fastest people shuttle the torch while the slowest cross together.

Reddit
Output
Everyone crosses in 17 minutes
Input
Four people taking 1, 2, 5 and 10 minutes, one torch and a two-person bridge
Relationship

What connects the input and output?

Send 1 and 2 across, 1 returns, 5 and 10 cross, 2 returns, then 1 and 2 cross again. The times are 2 + 1 + 10 + 2 + 2.

Sources

1
  1. en.wikipedia.org: Cross the bridge in 17 minutesen.wikipedia.orgCC-BY-SA-4.0

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