Question

Помагите решить задачу В полдень от пристани отошёл теплоход со скоростью 16км/ч. Через 3 ч вслед ему отошёл другой теплоход и чериз12 ч догнал первый. С какой скоростью двигался второй теплоход

Answer 1

1) Находим, сколько проплыл первый теплоход за все время плавания
16×(12+3)=240 (км)
2) Делим это же расстояние на 12 часов, чтобы найти скорость второго теплохода
240÷12=20 (км)
ОТВЕТ: 20 КМ - СКОРОСТЬ ВТОРОГО ТЕПЛОХОДА

Answer 2

Problem Analysis

To solve this problem, we need to determine the speed of the second boat. We are given that the first boat departed from the pier at noon with a speed of 16 km/h. After 3 hours, the second boat departed and caught up with the first boat after 12 hours. We need to find the speed of the second boat.

Solution

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

The first boat traveled for 3 hours before the second boat started. Therefore, the distance covered by the first boat in those 3 hours is 3 * 16 = 48 km.

Both boats traveled for 12 hours until the second boat caught up with the first boat. During this time, the first boat traveled a distance of 12 * 16 = 192 km.

Since the second boat caught up with the first boat, it also traveled a distance of 192 km.

Now, let's set up an equation to solve for the speed of the second boat:

48 + 12x = 192

Simplifying the equation:

12x = 192 - 48

12x = 144

x = 144 / 12

x = 12

Therefore, the speed of the second boat is 12 km/h.

Answer

The second boat was moving at a speed of 12 km/h.