Question

Расстояние между городами 1200 км.Из одного города в другой выехала машина со скоростью 42км/ч.через 4 часа на встречу ей из другого города выехала машина,скорость которой 44 км/ч.через сколько часов после выезда второй машины произойдет встреча машин?

Answer 1

42*4=168(км)-успеет проехать машина 1

1200-168=1032(км)-

42+44=86  совмес.скорость

1032:86=12(ч.)

Answer 2

Problem Analysis

We are given the following information: - The distance between two cities is 1200 km. - A car starts from one city and travels at a speed of 42 km/h. - After 4 hours, another car starts from the second city and travels towards the first car at a speed of 44 km/h.

We need to determine how many hours it will take for the two cars to meet.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it takes for the first car to reach the meeting point:

Time taken by the first car = Distance / Speed = 1200 km / 42 km/h

Now, let's calculate the time it takes for the second car to reach the meeting point:

Time taken by the second car = Distance / Speed = 1200 km / 44 km/h

Since the second car started 4 hours after the first car, we need to subtract 4 hours from the time taken by the second car.

Finally, we can calculate the total time it takes for the two cars to meet by adding the time taken by the first car and the adjusted time taken by the second car.

Let's calculate the total time:

Total time = Time taken by the first car + (Time taken by the second car - 4 hours)

Now, let's substitute the values and calculate the total time:

Total time = (1200 km / 42 km/h) + [(1200 km / 44 km/h) - 4 hours]

Calculation

Let's calculate the total time:

Total time = (1200 km / 42 km/h) + [(1200 km / 44 km/h) - 4 hours]

Total time = 28.57 hours + (27.27 hours - 4 hours)

Total time = 28.57 hours + 23.27 hours

Total time = 51.84 hours

Answer

After approximately 51.84 hours (or 51 hours and 50 minutes), the two cars will meet.

Please note that this is an approximate value and may vary slightly depending on the exact calculations.

Let me know if there is anything else I can help you with!