Question

Из города Семей выехал грузовой автомобиль со скоростью 40км/ч, а из Усть-Каменогорска в тоже время выехал легковой автомобиль со скоростью 60 км / ч. Через какое время встретиться автомобили, если расстояние между городами 200 км? * 1 балл А) через 4 ч В) через 3 ч С) через 2ч D) через 10 ч Е) Нет решения

Answer 1

Ответ:

1) 40*2 = 80(км) - расстояние, которое грузовик проедет за 2 часа.

2) 60*2 =120 (км) - расстояние, которое проехал легк. автомобиль.

Т.к. между городами 40 км, то из расстояния, которое проехала машина, надо вычесть эту дистанцию или же к расстоянию, которое проехал грузовик, нужно прибавить её:

3) 120-40= 80(км)

80=80

или

4) 80+40= 120(км)

120=120

Ответ: да, легковой автомобиль догонит грузовик через 2 часа

прости если не так

Answer 2

Problem Analysis

We are given that a truck leaves the city of Semey with a speed of 40 km/h, and at the same time, a car leaves Ust-Kamenogorsk with a speed of 60 km/h. We need to determine how long it will take for the vehicles to meet if the distance between the cities is 200 km.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's calculate the time it takes for each vehicle to travel the distance between the cities:

For the truck: - Distance = 200 km - Speed = 40 km/h - Time = 200 km / 40 km/h = 5 hours

For the car: - Distance = 200 km - Speed = 60 km/h - Time = 200 km / 60 km/h ≈ 3.33 hours

Since the car takes less time to cover the distance, we can conclude that the vehicles will meet after approximately 3.33 hours.

Therefore, the correct answer is B) через 3 ч.

Explanation

The truck and the car are traveling towards each other. The truck is traveling at a speed of 40 km/h, and the car is traveling at a speed of 60 km/h. Since the car is traveling faster, it will cover the distance between the cities in less time. As a result, the vehicles will meet before the truck reaches the destination.

Verification

Let's verify our answer using the given information.

The truck travels at a speed of 40 km/h for 5 hours, covering a distance of 40 km/h * 5 h = 200 km.

The car travels at a speed of 60 km/h for 3.33 hours, covering a distance of 60 km/h * 3.33 h ≈ 199.8 km.

As we can see, the car covers a distance of approximately 199.8 km, which is close to the total distance of 200 km between the cities. This confirms that our answer is correct.

Conclusion

The truck and the car will meet after approximately 3.33 hours of travel time.

Note: The search results provided by You.com did not directly answer the question. However, the formula for calculating time using distance and speed is a well-known concept in physics and mathematics.