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A man swimming in a stream which flows 1...

A man swimming in a stream which flows `1 1/2\ km//hr` finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim? a. `4 1/2\ km//hr` b. `5 1/2\ km//hr` c. `7 1/2\ km//hr` d. none of these

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