Question

Задача 4 Класса: Между городом Зареченском и посёлком Ивантеевка 800.Из этих населённых пунктов навстречу друг к другу выехали легковая машина и грузовик.Через 3 часа расстояние между ними было 350 км.какое расстояние проехала легковая машина если скорость движения грузовика 70км/ч

Answer 1

800км - расстояние между пунктами. 800-350=450км - проехали грузовик и легковая машина за 3 часа. 450:3=150км/час - скорость сближения грузовика и легковой машины. 150-70=80км/час- скорость легкового автомобиля. 80*3=240км - проехал легковой автомобиль. Ответ: 240 км проехал легковой автомобиль.

Answer 2

Problem Analysis

We are given that the distance between the city of Zarechensk and the village of Ivanteevka is 800 km. A car and a truck started driving towards each other from these two locations. After 3 hours, the distance between them was 350 km. We need to find the distance traveled by the car, given that the truck's speed is 70 km/h.

Solution

Let's assume that the car's speed is x km/h. Since the car and the truck are driving towards each other, their combined speed is the sum of their individual speeds. Therefore, the combined speed is x + 70 km/h.

We can use the formula distance = speed × time to find the distance traveled by each vehicle.

For the car: distance_car = speed_car × time = x × 3

For the truck: distance_truck = speed_truck × time = 70 × 3

We are given that the sum of the distances traveled by the car and the truck is 350 km: distance_car + distance_truck = 350

Substituting the values, we get: 3x + 210 = 350

Simplifying the equation: 3x = 350 - 210 3x = 140 x = 140 / 3

Therefore, the car's speed is approximately 46.67 km/h.

To find the distance traveled by the car, we can substitute the car's speed into the formula: distance_car = speed_car × time = 46.67 × 3

Calculating the distance traveled by the car: distance_car = 140 km

Therefore, the car traveled a distance of 140 km.

Answer

The car traveled a distance of 140 km.

Note: The above solution assumes that the car and the truck started driving from their respective locations at the same time.