Question

Из пункта А одновременно,в противоположных напрвлениях отправились лодка и плот.Собственная скорость лодки-12 км\ч.Через 1 час плот оказался в пункте В,а лодка-в пункте С.1)Какова скорость течения реки?2)С какой скоростью движется лодка?3)Какое расстояние проплыла лодка?4)Какое расстояние будет между участками движения,если они будут плыть ещё 1 час?5)Сколько времения пройдёт с момента отплытия из пункта А,когда расстояние между ними будет 30 км?

Answer 1

1)6 км

2)6 км

3)6 км

4)12 км

5) 5 ч.

 Вроде бы так

 

Answer 2

Given Information:

- The boat's speed is 12 km/h. - After 1 hour, the raft is in point B, and the boat is in point C.

1) Finding the River's Current Speed:

To find the river's current speed, we can use the formula: current speed = distance / time. Since the boat and the raft are moving in opposite directions, the distance between them is the sum of the distances traveled by each of them. Let's assume the current speed is represented by x.

The boat's speed is 12 km/h, and it has been traveling for 1 hour. Therefore, the distance traveled by the boat is 12 km. The raft's speed is unknown, but we can find it by using the formula: distance = speed × time. The distance traveled by the raft is also 12 km because it has been traveling for 1 hour.

The total distance between the boat and the raft is the sum of the distances traveled by each of them, which is 12 km + 12 km = 24 km.

Using the formula current speed = distance / time, we can find the current speed: x = 24 km / 1 hour = 24 km/h.

Therefore, the speed of the river's current is 24 km/h.

2) Finding the Boat's Speed:

The boat's speed is given as 12 km/h. Therefore, the boat is moving at a speed of 12 km/h.

3) Finding the Distance Traveled by the Boat:

The boat has been traveling for 1 hour at a speed of 12 km/h. Therefore, the distance traveled by the boat is 12 km.

4) Finding the Distance Between the Boat and the Raft After 1 More Hour:

To find the distance between the boat and the raft after 1 more hour, we need to calculate the distance traveled by each of them.

The boat's speed is 12 km/h, and it has been traveling for 2 hours. Therefore, the distance traveled by the boat is 12 km/h × 2 hours = 24 km.

The raft's speed is unknown, but we can assume it is the same as before. Therefore, the distance traveled by the raft is 12 km.

The total distance between the boat and the raft after 1 more hour is the sum of the distances traveled by each of them, which is 24 km + 12 km = 36 km.

Therefore, the distance between the boat and the raft after 1 more hour is 36 km.

5) Finding the Time When the Distance Between the Boat and the Raft is 30 km:

To find the time it takes for the distance between the boat and the raft to be 30 km, we need to calculate the time it takes for the boat and the raft to cover that distance.

The boat's speed is 12 km/h, and the raft's speed is unknown but assumed to be the same as before. Therefore, the relative speed between the boat and the raft is 12 km/h.

Using the formula time = distance / speed, we can find the time it takes for the distance between the boat and the raft to be 30 km: time = 30 km / 12 km/h = 2.5 hours.

Therefore, it will take 2.5 hours from the moment they departed from point A for the distance between them to be 30 km.