A river flows at speed of 6 km/hr. Surendra swims downstream for some distance in just 12 hours. But he takes 18 hours to return the same distance upstream. How fast is Surendra in still water?

QuestionA river flows at speed of 6 km/hr. Surendra swims downstream for some distance in just 12 hours. But he takes 18 hours to return the same distance upstream. How fast is Surendra in still water?
Typemultiple_choice
Option30 km/hrcorrect
Option24 km/hrincorrect
Option12 km/hrincorrect
Option36 km/hrincorrect

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