The speed of the boat on the river is 25.8 km / h, and upstream the speed of the boat is 21.2 km / h

The speed of the boat on the river is 25.8 km / h, and upstream the speed of the boat is 21.2 km / h 1) Find the speed of the current 2) Find your own speed of the boat

1. The speed of the boat along the river is: Vno = 25.8 km / h;

2. Speed of the boat against the stream of the river: Vnp = 21.2 km / h;

3. River flow speed: Vp km / h;

4. Own speed of the boat: Vc km / h;

5. Find the speed difference:

Vno – Vnp = (Vc + Vp) – (Vc – Vp) =

Vc + Vp – Vc + Vp =

2 * Vp = 25.8 – 21.2 = 4.6;

6. River flow speed:

Vp = (Vno – Vnp) / 2 = 4.6 / 2 = 2.3 km / h;

7. The boat’s own speed is equal to:

Vc = Vno – Vp = 25.8 – 2.3 = 23.5 km / h.

Answer: the speed of the river flow is 2.3 km / h, the own speed of the boat is 23.5 km / h.