Question

a boat takes 2 hours and 30 minutes to travel 6km down and come back to initial positions. the boat travels with speed 5 km per hour in still water, the speed of river flow is?

Answer 1

Thank you for asking this question. here is your answer:

6/(5+x) + 6/(5-x) = 2.5

6(5-x) + 6(5+x) = 2.5(5+x)(5-x)

30 - 6x + 30 + 6x = 2.5(25-x²)

-62.5 = -x²

x² = 62.5

x = 7.91 m/s

= 7.91 m/s

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