Question

Помогите пожалуйста решить !!Помогите пожалуйста решить !!Автобус проходит расстояние от города до села за 1,8 ч,а легковая автомашина - за 0,8 ч. Найдите скорость автобуса ,если известно,что она меньше скорости легковой автомашины на 50 км/ч.

Answer 1

90-50=40 км/ч - скорость автобуса

Answer 2

90-50=40 км\ч скорость автобуса 

Answer 3

Problem Analysis

We are given that a bus travels a distance from a city to a village in 1.8 hours, while a car travels the same distance in 0.8 hours. We need to find the speed of the bus, given that it is 50 km/h slower than the speed of the car.

Solution

Let's assume the speed of the car is x km/h. According to the problem, the speed of the bus is 50 km/h slower than the speed of the car. Therefore, the speed of the bus can be represented as (x - 50) km/h.

We know that speed is equal to distance divided by time. Let's assume the distance between the city and the village is d km.

For the car: - Speed = x km/h - Time = 0.8 hours - Distance = d km

For the bus: - Speed = (x - 50) km/h - Time = 1.8 hours - Distance = d km

Using the formula speed = distance / time, we can set up the following equations:

For the car: x = d / 0.8 (Equation 1)

For the bus: (x - 50) = d / 1.8 (Equation 2)

To solve for x, we can solve these two equations simultaneously.

Solution Steps

1. Substitute Equation 1 into Equation 2 to eliminate d: (d / 0.8 - 50) = d / 1.8 2. Simplify the equation: (d / 0.8) - 50 = (d / 1.8) 3. Multiply both sides of the equation by 0.8 and 1.8 to eliminate the denominators: 1.8 * (d / 0.8) - 0.8 * 50 = d 1.8d - 40 = d 4. Subtract d from both sides of the equation: 1.8d - d = 40 0.8d = 40 5. Divide both sides of the equation by 0.8 to solve for d: d = 40 / 0.8 d = 50 6. Substitute the value of d back into Equation 1 to solve for x: x = 50 / 0.8 x = 62.5

Therefore, the speed of the car is 62.5 km/h and the speed of the bus is (62.5 - 50) = 12.5 km/h.

Answer

The speed of the bus is 12.5 km/h.