A boat travels 24 km upstream in 4 hours and 24 km downstream in 2 hours. What is the speed of the boat in still water?

धारा के प्रतिकूल गति = 24/4 = 6 किमी/घंटा। धारा के अनुकूल गति = 24/2 = 12 किमी/घंटा। शांत जल में गति = (12 + 6) / 2 = 9 किमी/घंटा।