Well this is possible. the only trick is in realizing that you want to get the two
slowest people across together, because otherwise you are wasting too
much time. but then once you get them across, how do you not make one of
them walk back with the flashlight? well, you just have one of the fast
people already there waiting to sprint the flashlight back across.
1. A & B crosses with flash light: 2 mins total time: 2 mins.
2. A comes back with flash light: 1 minute Total = 3 mins
3. C & D crosses with flash light: 10 mins Total=13 mins
4. B comes back with flash light: 2 mins Total=15 mins
5. A & B cross = 2 mins Total=17 mins
1. A & B crosses with flash light: 2 mins total time: 2 mins.
2. A comes back with flash light: 1 minute Total = 3 mins
3. C & D crosses with flash light: 10 mins Total=13 mins
4. B comes back with flash light: 2 mins Total=15 mins
5. A & B cross = 2 mins Total=17 mins
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