Question

В 8 часов утра из двух городов навстречу друг другу вышли 2 товарных поезда.которые встретились в тот же день в 20 ч. скорость первого 70 км.в час.второго 80 км.в час определи расстояние между городами

Answer 1

20-8=12 ч- время в пути каждого поезда
70+80=150 км/ч - скорость сближения
150*12=1800 км- расстояние между городами.

Answer 2

Calculation of Distance between Cities

To calculate the distance between the two cities, we can use the formula:

Distance = Speed x Time

Given that the first train has a speed of 70 km/h and the second train has a speed of 80 km/h, we need to determine the time it took for the trains to meet.

Calculation of Time

To calculate the time it took for the trains to meet, we can use the formula:

Time = Distance / Speed

Let's calculate the time it took for the trains to meet:

For the first train: - Speed = 70 km/h - Time = Distance / Speed

For the second train: - Speed = 80 km/h - Time = Distance / Speed

Since both trains started at 8:00 AM and met at 8:00 PM on the same day, the total time is 12 hours.

Calculation of Distance

To calculate the distance between the cities, we can use the formula:

Distance = Speed x Time

Let's calculate the distance between the cities:

For the first train: - Speed = 70 km/h - Time = 12 hours - Distance = Speed x Time

For the second train: - Speed = 80 km/h - Time = 12 hours - Distance = Speed x Time

Therefore, the distance between the two cities is the same for both trains.

Distance = 70 km/h x 12 hours = 840 km

So, the distance between the two cities is 840 kilometers.

Please note that the above calculations are based on the given information and assumptions.