Question

Из двух городов,расстояние между которыми 900 км,навстречу друг другу вышли две машины.Через сколько часов они встретятся,если скорость первой машины 60км/ч,а второй-90км/ч?

Answer 1

(60+90)=150 скорость сближения
900\150=6 часов в пути
Ответ: через 6 часов

Answer 2

60+90=150(км/ч) всего
900/150=6 часов через столько они встретятся
ответ: через 6 часов

Answer 3

Problem Analysis

We are given two cars that start from two different cities and are traveling towards each other. The distance between the cities is 900 km. We are also given the speeds of the two cars: the first car is traveling at 60 km/h, and the second car is traveling at 90 km/h. We need to determine how many hours it will take for the two cars to meet.

Solution

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

Time = Distance / Relative Speed

The relative speed is the sum of the speeds of the two cars since they are traveling towards each other.

Let's calculate the time it takes for the two cars to meet.

Calculation

The distance between the two cities is 900 km.

The speed of the first car is 60 km/h.

The speed of the second car is 90 km/h.

The relative speed of the two cars is the sum of their speeds: 60 km/h + 90 km/h = 150 km/h.

Using the formula, we can calculate the time it takes for the two cars to meet:

Time = Distance / Relative Speed

Time = 900 km / 150 km/h = 6 hours.

Therefore, it will take 6 hours for the two cars to meet.

Answer

The two cars will meet after 6 hours of traveling.

Note: The answer is based on the given information and assumes that the cars maintain a constant speed throughout the journey.