Question

Грузовик до остановки проехал 180 км и после остановки 120 км расстояние он преодолел за 5 часов двигаясь с одинаковой скоростью Сколько времени грузовик ехал до остановки Сколько времени он ехал после остановки

Answer 1

1)180+120=300 км всего проехал грузовик
2)300:5=60км/ч скорость грузовика
3)180:60=3ч проехал грузовик до остановки
4)120:60=2ч проехал грузовик после остановки

Answer 2

Problem Analysis

We are given that a truck traveled 180 km before stopping and then traveled an additional 120 km after the stop. The total time taken for the entire journey was 5 hours, and the truck traveled at a constant speed throughout. We need to determine how much time the truck traveled before the stop and how much time it traveled after the stop.

Solution

Let's assume that the truck traveled at a constant speed of x km/h.

To find the time the truck traveled before the stop, we can use the formula time = distance / speed. Therefore, the time before the stop is 180 km / x km/h.

To find the time the truck traveled after the stop, we can use the same formula. Therefore, the time after the stop is 120 km / x km/h.

Since the total time for the entire journey is given as 5 hours, we can write the equation:

time before the stop + time after the stop = 5 hours

Substituting the values we found earlier, we get:

(180 km / x km/h) + (120 km / x km/h) = 5 hours

Now, we can solve this equation to find the value of x and then calculate the time before and after the stop.

Let's solve the equation:

(180 km / x km/h) + (120 km / x km/h) = 5 hours

To simplify the equation, we can multiply both sides by x:

180 km + 120 km = 5x hours

Simplifying further:

300 km = 5x hours

Dividing both sides by 5:

60 km = x hours

Therefore, the truck traveled at a speed of 60 km/h.

Now, we can calculate the time before the stop and the time after the stop:

Time before the stop = 180 km / 60 km/h = 3 hours

Time after the stop = 120 km / 60 km/h = 2 hours

Answer

The truck traveled for 3 hours before the stop and 2 hours after the stop.

Note: The above solution assumes that the truck traveled at a constant speed throughout the journey.