The motor boat sailed for 3 hours down the river for 27 km. The speed of the current is 2 km / h. What is the boat’s own speed?

1. Let’s calculate what the speed of the boat along the river is equal to, if from the condition of the problem we know that in 3 hours of travel, it covered a distance of 27 km. To do this, the path traveled by the boat must be divided by the time it is on the way.
27/3 = 9 km per hour.
2. Now let’s determine the boat’s own speed, if we know that the speed of the river is 2 km per hour. To do this, the speed of the river must be subtracted from the speed of the boat along the river.
9 – 2 = 7 km per hour.
Answer: The boat’s own speed is 7 km per hour.