Question

Из двух пунктов одновременно навстречу друг другу выехали два велосипедиста.Скорость одного из них 15 км, а скорость другого 13 км. Через сколько часов велосипедисты встретятся, если расстояния между пунктами 84 км?

Answer 1

это очень чтоли трудго

Answer 2

13+15=28(км/ч)-общая скорость
84:28=3(ч)
ответ:они встретятся через 3 часа

Answer 3

Problem Analysis

Two cyclists start simultaneously from two different points and travel towards each other. The speed of one cyclist is 15 km/h, and the speed of the other cyclist is 13 km/h. The distance between the points is 84 km. We need to determine how many hours it will take for the cyclists to meet.

Solution

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

Time = Distance / Relative Speed

The relative speed is the sum of the speeds of the two cyclists. Let's calculate the time it takes for the cyclists to meet.

Calculation

Given: - Speed of one cyclist = 15 km/h - Speed of the other cyclist = 13 km/h - Distance between the points = 84 km

Relative Speed = Speed of cyclist 1 + Speed of cyclist 2

Relative Speed = 15 km/h + 13 km/h = 28 km/h

Time = Distance / Relative Speed

Time = 84 km / 28 km/h = 3 hours

Answer

The two cyclists will meet after 3 hours.

Explanation

The two cyclists are traveling towards each other, so their relative speed is the sum of their individual speeds. In this case, the relative speed is 28 km/h. The time it takes for the cyclists to meet is calculated by dividing the distance between the points (84 km) by the relative speed (28 km/h), resulting in 3 hours.