Question

лодка двигалась против течения за 2,4 ч прошла 36,72 км , найдите скорость течения если собственная скорость лодки равна 17,8 км/ч

Answer 1

1) 36,72:2,4=15,3 (км/ч) - скорость лодки против течения.

2) 17,8-15,3=2,5 (км/ч) - скорость течения. 

Ответ: 2, 5 км/ч. 

Answer 2

Calculating the River's Current Speed

To find the speed of the river's current, we can use the formula: Speed of boat in still water = (Speed of boat against the current + Speed of current) Given: - Speed of boat in still water = 17.8 km/h - Time taken to travel against the current = 2.4 hours - Distance traveled against the current = 36.72 km

Using the formula, we can calculate the speed of the current.

The speed of the boat against the current can be calculated using the formula: Speed of boat against the current = Distance / Time

Let's calculate the speed of the boat against the current first.

Calculating the Speed of the Boat Against the Current

The speed of the boat against the current is calculated as: Speed of boat against the current = Distance / Time

Substituting the given values: Speed of boat against the current = 36.72 km / 2.4 hours

Calculating: Speed of boat against the current = 15.3 km/h

Calculating the Speed of the Current

Now, we can use the formula: Speed of boat in still water = (Speed of boat against the current + Speed of current)

Given: - Speed of boat in still water = 17.8 km/h - Speed of boat against the current = 15.3 km/h

We can rearrange the formula to solve for the speed of the current: Speed of current = Speed of boat in still water - Speed of boat against the current

Substituting the given values: Speed of current = 17.8 km/h - 15.3 km/h

Calculating: Speed of current = 2.5 km/h

Answer

The speed of the river's current is 2.5 km/h.