Question

Расстояние между двумя городами 720км. Из этих городов навстречу друг другу вышли одновременно два поезда со скоростьями 38км.ч и 52км.ч. Через сколько часов поезда встретятся?

Answer 1

1) 38+52=90 (км/ч) - скорость сближения
2) 720:90=8 (ч)
Ответ: через 8 часов они встретятся

Answer 2

1). 38+52=90   2). 720:90=8 Ответ:через 8 часов

Answer 3

Problem Analysis

We have two trains traveling towards each other from two cities. The distance between the cities is 720 km. The trains have different speeds: one is traveling at 38 km/h and the other at 52 km/h. We need to determine how long it will take for the trains to meet.

Solution

To find the time it takes for the trains to meet, we can use the formula: time = distance / relative speed.

The relative speed of the trains is the sum of their individual speeds, since they are traveling towards each other. So, the relative speed is 38 km/h + 52 km/h = 90 km/h.

Using the formula, we can calculate the time it takes for the trains to meet:

time = distance / relative speed

time = 720 km / 90 km/h

time = 8 hours

Therefore, the trains will meet after 8 hours.

Answer

The trains will meet after 8 hours.