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

parallel and congruent

step-by-step explanation:

the movement of translation is linear.   these have the same translation because you are using the same rule for each point of the triangle so you will see the same slope being used to get from a point on the triangle to its image.

same slope!   you should think parallel when you see those 2 word together (well unless it's the same line but it can't be because we are coming from different points here)

congruent! because each point is being moved the same distance.

child does not get an education so she can use the molla on junk