The ratio of speed of two boats A and B in still water is 3:1. Both the boats A and B start from the same point in the river, A goes upstream and B goes downstream. After 2 hours the stream stops flowing and A starts rowing in the opposite direction to meet B. How much time after the stream stops flowing does A meet B?

1
2 hours
2
3 hours
3
4 hours
4
5 hours
5
6 hours

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