Question

Скорость течения реки равна 3,1 км/ч, а скорость катера против течения 25,8 км/ч. Найдите собственную скорость катера и его скорость по течению

Answer 1

Скорость катера:
25,8+3,1=28,9 км/ч
 Скорость катера по течению
28,9+3,1=32 км/ч

Answer 2

25,8+3,1=28,9км/ч собственная скорость катера
28,9+3,1=32км/ч скорость катера по течению

Answer 3

Calculating Boat's Speed

To find the boat's speed in still water and its speed against the current, we can use the following formulas:

1. Boat's Speed in Still Water (B): This can be calculated using the formula B = (C + R) / 2, where C is the speed of the boat in still water and R is the speed of the river's current. 2. Speed Against the Current (S): This can be calculated using the formula S = B - R, where B is the boat's speed in still water and R is the speed of the river's current.

Calculation

Given: - Speed of the river's current (R) = 3.1 km/h - Speed of the boat against the current (S) = 25.8 km/h

Using the formula S = B - R, we can solve for B (the boat's speed in still water):

25.8 = B - 3.1 B = 25.8 + 3.1 B = 28.9 km/h

So, the boat's speed in still water is 28.9 km/h.

Now, using the formula B = (C + R) / 2, we can solve for C (the boat's speed against the current):

28.9 = (C + 3.1) / 2 28.9 * 2 = C + 3.1 57.8 = C + 3.1 C = 57.8 - 3.1 C = 54.7 km/h

So, the boat's speed against the current is 54.7 km/h.

Therefore, the boat's speed in still water is 28.9 km/h, and its speed against the current is 54.7 km/h.