http://www.cleverscampcamp.com/lantern-family/
How I can save my family?
I stand along with three family members on one side of a rickety bridge on a dark night. It is very dangerous on this side so you need to cross the bridge. The bridge is strong enough to support two of us at once. It is also necessary for people crossing the bridge to carry a flashlight to guide our way, and the four of us have only one flashlight between us. I can cross the bridge in 1 minute, my brother in two, the mother 5, grandparents in ten minutes. How quickly can all be together on the other side? Lumbalth: I want my whole family to be saved! Sister Clara: you know it is a gap, and against the original intent of the puzzle. A flashlight not be able to shed enough light for safe passage on a bridge … anyway, well done, I guess. 17 minutes is the minimum.
Take your brother through: 2 min. Return: 1 min. Mom and grandfather Send via: 10 min. Brother returns with lamp: 2 min. You and your brother cross: 2min. Total: 17 min. Spend five minutes thinking time to save 2 minutes walk: priceless.
Coleman Rugged Battery Powered Lantern (Family Size)