The speed of the boat against the current is 11.3 km / h. The speed of the current is 3.9 km / h.

The speed of the boat against the current is 11.3 km / h. The speed of the current is 3.9 km / h. Find the boat’s own speed and its speed with the current.

1. Let the boat’s own speed be “X”. Let’s compose and solve the equation, if the speed of the boat against the current is 11.3 km / h, and the speed of the current is 3.9 km / h:

X – 3.9 = 11.3;

X = 11.3 + 3.9;

X = 15.2 (km / h).

2. Find the speed of the boat downstream:

15.2 + 3.9 = 19.1 (km / h).

Answer: the boat’s own speed is 15.2 km / h, its downstream speed is 19.1 km / h.