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4 people need to cross a river. 2 people can fit in a boat at a time. Each person takes 1, 2, 5 and 7 minutes to row the boat across the river, regardless of who else they take with them. What ordering would result in the shortest time to get everyone across the river?
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Graduate Software Developer

Interviewed at Ocado Group

3.3★
Jul 3, 2014

4 people need to cross a river. 2 people can fit in a boat at a time. Each person takes 1, 2, 5 and 7 minutes to row the boat across the river, regardless of who else they take with them. What ordering would result in the shortest time to get everyone across the river?

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