Speed of the boat against the current 11.3 km / h Speed of the current 3.9 km / h

Speed of the boat against the current 11.3 km / h Speed of the current 3.9 km / h Find your own speed of the boat and its speed with the current.

For the correct solution of the problem, it is important to understand that when a vessel moves in still water, it moves relative to the ground and water in the same way at its own speed. When the vessel moves downstream, its speed relative to the ground increases by an amount equal to the speed of the river flow, and when moving against the current, the speed of the vessel slows down by the same amount.

1). First, let’s find our own speed of the boat:

11.3 + 3.9 = 15.2 km / h;

2). Now you can determine the speed of the boat downstream:

15.2 + 3.9 = 19.1 km / h.