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A boat sails downstream from point A to ...

A boat sails downstream from point A to point B, which is 10 km away from A and then returns to A. If the actual speed of the boat (in still water) is 3 km/h, the trip from A to B takes 8 hours less than that from B to A. What must the actual speed of the boat for the trip from A to B to take exactly 100 minutes?

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The correct Answer is:
4 km/h
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