Question

Из двух городов расстояние между которыми 300 км Одновременно навстречу друг другу выехали два автобуса средняя скорость движения одного из них равна 54, 8 км / ч а скорость другого составляет 0, 7 скорости первого .Найдите расстояние между автобусами через 2, 5 ч после их отправления

Answer 1

54,8*0,7=38,36км/час скорость второго
54,8+38,36=93,16км/час скорость сближения
93,16*2,5=232,9км сблизятся за 2,5 часа
300-232,9=67,1км расстояние между ними через 2,5 часа

Answer 2

Problem Analysis

We are given that two buses start simultaneously from two cities that are 300 km apart. The first bus has a speed of 54.8 km/h, while the speed of the second bus is 0.7 times the speed of the first bus. We need to find the distance between the two buses after 2.5 hours.

Solution

To find the distance between the two buses after 2.5 hours, we need to calculate the distance traveled by each bus.

Let's start by calculating the distance traveled by the first bus. We can use the formula:

Distance = Speed × Time

For the first bus, the speed is 54.8 km/h and the time is 2.5 hours. Substituting these values into the formula, we get:

Distance of the first bus = 54.8 km/h × 2.5 hours

Next, let's calculate the distance traveled by the second bus. We know that the speed of the second bus is 0.7 times the speed of the first bus. So, the speed of the second bus is:

Speed of the second bus = 0.7 × 54.8 km/h

Now, we can calculate the distance traveled by the second bus using the same formula:

Distance of the second bus = (0.7 × 54.8 km/h) × 2.5 hours

Finally, to find the distance between the two buses, we subtract the distance traveled by the second bus from the distance traveled by the first bus:

Distance between the two buses = Distance of the first bus - Distance of the second bus

Let's calculate the values step by step.

Calculation

1. Distance of the first bus: - Speed of the first bus = 54.8 km/h - Time = 2.5 hours - Distance of the first bus = 54.8 km/h × 2.5 hours

2. Distance of the second bus: - Speed of the second bus = 0.7 × 54.8 km/h - Time = 2.5 hours - Distance of the second bus = (0.7 × 54.8 km/h) × 2.5 hours

3. Distance between the two buses: - Distance between the two buses = Distance of the first bus - Distance of the second bus

Let's calculate the values.

Calculation Results

1. Distance of the first bus: - Speed of the first bus = 54.8 km/h - Time = 2.5 hours - Distance of the first bus = 54.8 km/h × 2.5 hours = 137 km

2. Distance of the second bus: - Speed of the second bus = 0.7 × 54.8 km/h - Time = 2.5 hours - Distance of the second bus = (0.7 × 54.8 km/h) × 2.5 hours = 95.9 km

3. Distance between the two buses: - Distance between the two buses = Distance of the first bus - Distance of the second bus = 137 km - 95.9 km = 41.1 km

Answer

The distance between the two buses after 2.5 hours is 41.1 km.