Question

Лодка плыла вслед за плотом, когда плот был на расстоянии 12 км от неё. Через 4 ч лодка догнала плот. Скорость плота 2 км/ч. Чему равна скорость лодки?

Answer 1

1)2х4+12=20(км) - расстояние, которое проплыл плот
2)20:4=5(км/час) - скорость лодки

Answer 2

Если так,то, мне кажется, будет:
12км :4ч =3км/ч

Answer 3

Problem Analysis

We are given that a boat is following a raft, and when the raft is 12 km away from the boat, the boat catches up to the raft after 4 hours. The speed of the raft is given as 2 km/h. We need to determine the speed of the boat.

Solution

Let's assume the speed of the boat is x km/h.

We can use the formula: distance = speed × time to solve this problem.

The distance covered by the boat in 4 hours is equal to the distance covered by the raft in the same time. Since the raft's speed is given as 2 km/h, the distance covered by the raft in 4 hours is 2 × 4 = 8 km.

The distance between the boat and the raft decreases by 12 km in 4 hours, so the boat covers a distance of 12 km in 4 hours.

Using the formula, we can set up the equation:

distance covered by the boat = speed of the boat × time 12 km = x km/h × 4 hours

Simplifying the equation, we have:

12 km = 4x km

Dividing both sides of the equation by 4, we get:

3 km = x km/h

Therefore, the speed of the boat is 3 km/h.

Answer

The speed of the boat is 3 km/h.