Question

З двох міст відстань між якими 840 км . вирушили на зустрич один одному два поїзди. швидкість першого поїзда 100 км на год. а другого 110 км на год. через скількі годин вони зуструнуться?

Answer 1

1)100+110=210(км\ч)-Скорость;
2)840:210=4(ч)-Через 4 часа встретятся
 840:(100+110)=4
Ответ:Через 4 часа они встретятся.

Answer 2

Distance and Speed Calculation

To calculate the time it takes for two trains to meet, we need to consider the distance between the two cities and the speeds of the trains.

Given: - Distance between the two cities: 840 km - Speed of the first train: 100 km/h - Speed of the second train: 110 km/h

To find the time it takes for the trains to meet, we can use the formula:

Time = Distance / Relative Speed

The relative speed is the combined speed of the two trains. In this case, it would be the sum of their individual speeds.

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

Relative Speed = Speed of Train 1 + Speed of Train 2

Relative Speed = 100 km/h + 110 km/h = 210 km/h

Time = Distance / Relative Speed

Time = 840 km / 210 km/h = 4 hours

Therefore, the two trains will meet after 4 hours.