Doctor Johnson was hiking with his wife and their son.

They needed to cross a river. The row boat can only hold 100 kg.

The doctor weighs 80 kg, his wife weighs 60 kg, and their son weighs 30 kg.

How can all three of them cross the river?

See the answer
Answer: Mother and son cross first, then son gets out of the boat and mother returns. Mother gets out of the boat and the doctor crosses the river. The doctor gets out of the boat and the son crosses back to get the mother.

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