Afisherman traveled in a boat from point n upstream. after having traveled 6 km, he stopped rowing and 2 hour 40 min after first leaving n, he was brought back to n by the current. knowing that the speed of the boat in still water is 9 km/hour, find the speed of the river’s current.

upstream means going in opposite direction of river's current

downstream means going in same direction of river's current

Let the speed of river's current be x km/hour

so net speed of boat in upstream = (9-x) km/hour

net speed of boat in downstream = (9+x) km/hour

total time taken = 2 hours 40 minutes = 8/3 hours

total time taken = time in upstream + time in downstream

( time = distance / speed)

8/3 = 6/(9-x) + 6/(9+x)

solving for x

x = 6.36 km/hour

so speed of river's current = 6.36 km/hour

glide reflection.

its mainly because the pattern will be infinite and will never end. it will look like a gilder or like a filpbook when set to motion.

your answer would be 10x - 1