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At his usual rowing rate, Rahul can t...

At his usual rowing rate, Rahul can travel 12 miles downstream in a certain river in 6 hours less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for his 24-mile round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current in miles per hours? `1 1/3` b. `1 2/3` c. `2 1/3` d. `2 2/3`

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