Amotorboat travels 305km in 5 hours going upstream and 651km in 7 hours going downstream. what is the rate of the boat in still water and what is the rate of the current?

Recall your d = rt, distance = rate * time.

b = speed rate of the boat.

c = speed rate of the current.

keeping in mind that, as the boat goes Upstream, against the current, it's speed is not "b", but is really " b - c ", because the current is subtracting speed from it.

likewise, when the boat is going Downstream, because is going with the current, is really going faster at " b + c ".



what is the speed of the boat?  well, 61 + c = b.