Question

Расстояние от одного города до другого-387 км.одновременно из этих городов вышли навстречу друг другу два теплохода.один шел со скоростью 23 км/ч,а другой на 3 км/ч меньше первого.через сколько часов теплоходы встретятся

Answer 1

1) 23-3=20-км/ч другой теплоход
2) 20+23=43-км/ч вместе два теплохода
3)387:43=9 ч
Ответ: через 9 часов

Answer 2

Problem Analysis

We are given that the distance between two cities is 387 km. Two boats start simultaneously from these cities and move towards each other. The first boat has a speed of 23 km/h, while the second boat has a speed 3 km/h less than the first boat. We need to determine how many hours it will take for the boats to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. Let's calculate the time it takes for each boat to cover the distance between the cities.

The first boat's speed is 23 km/h, so the time it takes for the first boat to cover the distance is: time1 = distance / speed1 = 387 km / 23 km/h.

The second boat's speed is 3 km/h less than the first boat's speed, so its speed is 23 km/h - 3 km/h = 20 km/h. The time it takes for the second boat to cover the distance is: time2 = distance / speed2 = 387 km / 20 km/h.

To find the total time it takes for the boats to meet, we can add the times for each boat: total time = time1 + time2.

Let's calculate the total time.

Calculation

Using the given values: - Distance = 387 km - Speed1 = 23 km/h - Speed2 = 20 km/h

We can calculate the time it takes for each boat to cover the distance: - time1 = 387 km / 23 km/h = 16.826 hours - time2 = 387 km / 20 km/h = 19.35 hours

Now, let's calculate the total time: - total time = time1 + time2 = 16.826 hours + 19.35 hours = 36.176 hours.

Answer

The two boats will meet after approximately 36.176 hours.

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