Question

От двух пристаней отошли одновремено навстречу друг другу катер и лодка и встретились через 3 часа.Скорость лодки - 15 км / ч а катера - в 4 раза болше.Найдите расстояние между пристанями. КАК ЗДЕЛАТЬ КРАТКУЮ ЗАПИСЬ , ЧЕРТЁЖ,ТАБЛИЦУ И РЕШЕНИЯ ОТВЕТ

Answer 1

1)  12*5=60 км.ч- катер
2)60+12= 72 км.ч - общая скорость 
3) 72*5=360 км - между пристанями 

Answer 2

Problem Analysis

We are given that a boat and a motorboat leave two piers simultaneously and meet after 3 hours. The speed of the boat is 15 km/h, while the speed of the motorboat is 4 times greater. We need to find the distance between the piers.

Solution

Let's denote the distance between the piers as d.

We know that the time it takes for the boat and the motorboat to meet is 3 hours. We can use the formula time = distance / speed to write two equations:

For the boat: 3 = d / 15 For the motorboat: 3 = d / (4 * 15) To find the distance between the piers, we can solve these two equations simultaneously.

Solving the Equations

Let's solve the equations and to find the distance between the piers.

From equation 3 = d / 15

Multiplying both sides of the equation by 15, we get: 45 = d From equation 3 = d / (4 * 15)

Multiplying both sides of the equation by 4 * 15, we get: 180 = d Comparing equations and we see that both equations give the same value for d, which is 45 km.

Therefore, the distance between the piers is 45 km.

Summary

The distance between the piers is 45 km. This was determined by solving the equations 3 = d / 15 and 3 = d / (4 * 15) simultaneously.