Question

9. Расстояние от города до села автобус проходит за 1,8 ч, а легковая машина за 0,8 ч. Чему равна скорость автобуса, если она меньше скорости легковой машины на 50 км/ч?​

Answer 1

Пусть х км/ч - скорость автобуса, тогда (х + 50) км/ч - скорость легковой машины. Уравнение:

х · 1,8 = (х + 50) · 0,8

1,8х = 0,8х + 40

1,8х - 0,8х = 40

х = 40

Ответ: 40 км/ч.

Проверка:

40 · 1,8 = 90 · 0,8 = 72 км - расстояние от города до села

Answer 2

Calculating the Bus Speed

To calculate the speed of the bus, we can use the formula:

Speed = Distance / Time

Given that the bus takes 1.8 hours to cover the distance and the car takes 0.8 hours, we can use these values to calculate the speed of the bus.

Calculating the Speed of the Bus

The speed of the bus can be calculated using the formula:

Speed = Distance / Time

Let's assume the distance from the city to the village is D and the speed of the bus is S.

The bus takes 1.8 hours to cover the distance, so: D = 1.8S

The car takes 0.8 hours to cover the same distance, so: D = 0.8(S + 50) (since the car is 50 km/h faster than the bus)

We can solve these two equations to find the speed of the bus.

Solving for the Speed of the Bus

By equating the two expressions for D, we get: 1.8S = 0.8(S + 50)

Solving for S: 1.8S = 0.8S + 40 1S = 40 S = 40 km/h

So, the speed of the bus is 40 km/h.