Question

Задача даю 50 балов: А.)из двух городов,расстояние между которыми 620 км,выехали одновременно на встречу друг другу два автобуса.Скорость одного из них была 75 км/ч,а вторго 80 км/ч.Через какое время они встретились? Б.)От станций одновременно в противоположных направлениях отошли два поезда.Первый поезд шёл со скоростью 83 км/ч,а второй-72 км/ч.Через сколько часов расстояние между ними будет 1395 км? В.)Самолет за 4 часа пролетел 3280 км.За какое время он пролетит 5740 км?

Answer 1

А) 1)80+75=155(км/ч) общая скорость.
2) 620:155=4(ч) они встретились.

Б) 1) 83+72=155(км/ч) общая скорость.
2) 1395:155=9(ч)

В) 1) 3280:4=820(км/ч) скорость самолета.
2) 5740:820=7(ч)

Answer 2

А)620:(75+80)=4(ч)

Б)1395:(83+72)=9(ч)

В)1)3280:4=820(км)-пролетит за 1 час
2)5740:820=7(ч)

Answer 3

Task A: Meeting of Two Buses

To find out when two buses, traveling towards each other, will meet, we can use the formula: \[ \text{time} = \frac{\text{distance}}{\text{combined speed}} \]

Given: - Distance between the two cities = 620 km - Speed of the first bus = 75 km/h - Speed of the second bus = 80 km/h

Using the formula, we can calculate the time it takes for the buses to meet: \[ \text{time} = \frac{620}{75 + 80} \]

\[ \text{time} = \frac{620}{155} \]

\[ \text{time} = 4 \text{ hours} \]

The two buses will meet after 4 hours.

Task B: Meeting of Two Trains

To determine when two trains, moving in opposite directions, will be 1395 km apart, we can use the formula: \[ \text{time} = \frac{\text{distance}}{\text{combined speed}} \]

Given: - Speed of the first train = 83 km/h - Speed of the second train = 72 km/h - Distance to be covered = 1395 km

Using the formula, we can calculate the time it takes for the trains to be 1395 km apart: \[ \text{time} = \frac{1395}{83 + 72} \]

\[ \text{time} = \frac{1395}{155} \]

\[ \text{time} = 9 \text{ hours} \]

The distance between the two trains will be 1395 km after 9 hours.

Task C: Flight Distance

To find out how long it will take for a plane to cover a distance of 5740 km, we can use the formula: \[ \text{time} = \frac{\text{distance}}{\text{speed}} \]

Given: - Distance to be covered = 5740 km - Time taken to cover 3280 km = 4 hours

Using the formula, we can calculate the time it takes for the plane to cover 5740 km: \[ \text{speed} = \frac{3280}{4} \]

\[ \text{speed} = 820 \text{ km/h} \]

\[ \text{time} = \frac{5740}{820} \]

\[ \text{time} \approx 7 \text{ hours} \]

The plane will take approximately 7 hours to cover a distance of 5740 km.

I hope this helps! If you have further questions or need additional assistance, feel free to ask.