Bridge Crossing: BC
Bring Back: BB
Persons: [01], [03], [06], [08] and [12].
Time Count: TC
SOLUTION:
BC: [01], [03] (TC: 27)
BB: [01]
BC: [12], [08] (TC: 14) (KEY)
BB: [03]
BC: [01], [06] (TC: 05)
BB: [01]
BC: [01], [03] (TC: 01)
KEY: Crossing 12+8=20 in 12 Seconds and return back in 3 Seconds. *[]
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