Question

Автобус и автомобиль движутся навстречу друг другу. Скорость автомобиля 90 км/ч, а скорость автобуса составляет 2/3 скорости автомобиля. Через сколько времени они встретятся если расстояние между ними 36 км?

Answer 1

Ответ:

4 часа

Пошаговое объяснение:

1)90:3=30(км/ч)-1/3 скорости автомобиля

2)30×2=60(км/ч)-скорость автобуса

3)60+90=150(км/ч)-общая скорость

36км=36000 м

4)36000:150=240(мин)-время

240мин=4 часа

Answer 2

Problem Analysis

We are given that a bus and a car are moving towards each other. The car's speed is 90 km/h, and the bus's speed is 2/3 of the car's speed. We need to determine how long it will take for them to meet if the distance between them is 36 km.

Solution

To solve this problem, we can use the formula: time = distance / relative speed. The relative speed is the sum of the speeds of the car and the bus since they are moving towards each other.

Let's calculate the relative speed first. The bus's speed is 2/3 of the car's speed, so the relative speed is:

relative speed = car's speed + bus's speed = 90 km/h + (2/3) * 90 km/h

Now, let's calculate the time it will take for them to meet using the formula:

time = distance / relative speed

Substituting the given values:

time = 36 km / (90 km/h + (2/3) * 90 km/h)

Now, let's calculate the time.

Calculation

To calculate the time, we need to evaluate the expression:

time = 36 km / (90 km/h + (2/3) * 90 km/h)

Using the given values:

time = 36 km / (90 km/h + (2/3) * 90 km/h)

time = 36 km / (90 km/h + (2/3) * 90 km/h)

time = 36 km / (90 km/h + (2/3) * 90 km/h)

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**time = 36 km / (90 km/h + (2/3