Question

Грузовая машина проехала 336 км с одинаковой скоростью 42 км/ч. На обратный путь машина затратила на 1ч меньше. С какой скоростью возращалась машина?

Answer 1

1)336:42=8ч 2)8-1=7 3)1-(42+7)=48 (км/ч)

Answer 2

Путь: 336
Скорость туда: 42 км/ч
Время туда: 336/42 = 8ч
Время обратно: 8-1=7 ч
Скорость обратно: 336/7 = 48 км/ч

Answer 3

Problem Analysis

We are given that a truck traveled a distance of 336 km at a constant speed of 42 km/h. On the return journey, the truck took 1 hour less to cover the same distance. We need to determine the speed at which the truck returned.

Solution

Let's assume that the time taken for the forward journey is t hours. Since the distance traveled is the same, the time taken for the return journey would be t - 1 hours.

We can use the formula speed = distance / time to calculate the speed of the truck on the return journey.

Calculation

Given: - Distance = 336 km - Speed on the forward journey = 42 km/h - Time taken for the forward journey = t hours - Time taken for the return journey = t - 1 hours

Using the formula speed = distance / time, we can calculate the speed on the return journey as follows:

Speed on the forward journey = Distance / Time taken for the forward journey

42 km/h = 336 km / t hours

Solving for t, we get:

t = 336 km / 42 km/h = 8 hours

Therefore, the time taken for the forward journey is 8 hours.

The time taken for the return journey is t - 1 = 8 - 1 = 7 hours.

Now, we can calculate the speed on the return journey:

Speed on the return journey = Distance / Time taken for the return journey

Speed on the return journey = 336 km / 7 hours

Speed on the return journey ≈ 48 km/h

Answer

The truck returned at a speed of approximately 48 km/h.