Indiana Jones need to cross a flimsy rope bridge a mile long. Its so dark that it is impossible to cross the bridge without a flashlight. Furthermore the bridge is so weak that it can only support the weight of 2 people. The party has just 1flashlight which has a weak beam, So whenever two people cross, they are constrained to walk together at the speed of the slower person. Indiana Jones can cross the bridge in 5 minutes. His girlfriend can cross in 10minutes. His father needs 25. They need to get everyone across safely in 1hour. Can they do it? How?

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