Question

расстояние между двумя причалами 72 км.от этих причалов одновременно отошли два теплохода со скоростями 20 км\ч и 16 км\ч и пошли на встречу один другому . через сколько часов произойдёт встреча

Answer 1

20+16=36 км/час скорость сближения

72:36=2 часа идти до встречи

Answer 2

смотри вложение  """"""""""""""""""""""""""""""""""""""""""""""""""""""

Answer 3

Problem Analysis

We are given that there are two docks that are 72 km apart. Two ships start simultaneously from these docks and move towards each other. The speeds of the ships are given as 20 km/h and 16 km/h. We need to find out how many hours it will take for the ships to meet.

Solution

To find the time it takes for the ships to meet, we can use the formula:

Time = Distance / Relative Speed

The relative speed of the two ships is the sum of their individual speeds, as they are moving towards each other. Let's calculate the time it takes for the ships to meet.

Calculation

Given: - Distance between the docks = 72 km - Speed of the first ship = 20 km/h - Speed of the second ship = 16 km/h

The relative speed of the ships is the sum of their speeds:

Relative Speed = Speed of the first ship + Speed of the second ship

Relative Speed = 20 km/h + 16 km/h

Relative Speed = 36 km/h

Now, we can calculate the time it takes for the ships to meet using the formula:

Time = Distance / Relative Speed

Time = 72 km / 36 km/h

Time = 2 hours

Answer

The ships will meet after 2 hours.

Explanation

The two ships are moving towards each other, and their combined speed is 36 km/h. Since the distance between the docks is 72 km, it will take 2 hours for the ships to meet. During this time, the first ship will travel 20 km/h * 2 hours = 40 km, and the second ship will travel 16 km/h * 2 hours = 32 km. The sum of these distances is equal to the distance between the docks, confirming that the ships will meet after 2 hours.