Find the speed of the boat along the river and the speed upstream if its own speed is 10 4/5

Find the speed of the boat along the river and the speed upstream if its own speed is 10 4/5 and the speed of the river is 6/5.

We add the boat’s own speed to the speed of the river flow, this will be the speed downstream:

10 4/5 + 6/5 = 54/5 + 6/5 = 60/5 = 12 km / h.

We subtract the speed of the river from the speed of the boat, this will be the speed against the current:

10 4/5 – 6/5 = 54/5 – 6/5 = 48/5 = 9 3/5 km / h.

Answer: 12 km / h – downstream speed; 9 3/5 km / h – speed against the current.