A boat can travel 60 km downstream in 4 hours. If the speed of the boat in still water is 13 km/h, then in what time will it cover 30 km upstream?

1. A.3 5/7 hours
2. B.3 4/7 hours✓ Correct
3. C.2 8/11 hours
4. D.2 4/7 hours

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