Question

Со станции одновременно в противоположных направлениях отправились два поезда. Один поезд ехал со скоростью 72 км/ч, а другой - 70 км /ч. Какое расстояние было между ними, когда второй поезд проехал 210 км?

Answer 1

210/70=3 ч - ехал второй поезд и первый
72+70=142 км/ч - скорость удаления
142*3=426 км - расстояние между ними

Или

210/70=3 ч - ехал второй поезд
72*3=216 км - проехал первый поезд
216+210=426 км

Answer 2

Calculation of the Distance between the Trains

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

Distance = Speed x Time

Let's calculate the time it takes for the second train to travel 210 km at a speed of 70 km/h:

Time = Distance / Speed = 210 km / 70 km/h = 3 hours

Now, let's calculate the distance traveled by the first train during this time. The first train is traveling at a speed of 72 km/h, so:

Distance = Speed x Time = 72 km/h x 3 hours = 216 km

Therefore, when the second train has traveled 210 km, the first train has traveled 216 km. The distance between them is the difference between these two distances:

Distance between the trains = 216 km - 210 km = 6 km

So, when the second train has traveled 210 km, the distance between the two trains is 6 km.