The own speed of the motor ship is 30 km / h, the speed of the river flow is 4 1/2 km / h

The own speed of the motor ship is 30 km / h, the speed of the river flow is 4 1/2 km / h, how long will the motor ship take to cover 23 km along the river?

Let’s find the speed of the ship along the river.
To do this, add the speed of the river to its own speed.
30 + 4 1/2 = 34 1/2 km / h.
We find the time for which the ship will pass 23 km along the river.
To do this, divide the indicated distance by the speed.
23/34 1/2 = 23/69/2 = 23 * 2/69 = 46/69 = 2/3 hours.
Answer: The motor ship will cover the specified distance in 2/3 hours.