Question

Решите двумя способами ПЛИИЗ.Из города одновременно в одном направлении выехали автобус со скоростью 70 км/ч и машина 90 км/ч.Какое расстоняние будет между ними через 3 часа

Answer 1

Раз выезжают в одном направлении, значит автобус через 3 часа будет удалён на 210км от города, а машина на 270, отсюда: расстояние между ними будет 270-210=260км

2 способ- Раз выезжают в одном направлении, значит скорость удаления будет 90-70=20км, через 3 часа удалится на 20*3=60 км

Answer 2

Calculating Distance Between Bus and Car

To calculate the distance between the bus and the car after 3 hours, we can use two different methods: one based on the distance formula and the other based on the relative speed of the car and the bus.

Method 1: Distance Formula

Using the distance formula \( \text{distance} = \text{speed} \times \text{time} \), we can calculate the distance traveled by the bus and the car separately and then find the difference to determine the distance between them.

For the bus: - Speed of the bus = 70 km/h - Time = 3 hours - Using the distance formula: \( \text{distance}_{\text{bus}} = 70 \, \text{km/h} \times 3 \, \text{h} = 210 \, \text{km} \)

For the car: - Speed of the car = 90 km/h - Time = 3 hours - Using the distance formula: \( \text{distance}_{\text{car}} = 90 \, \text{km/h} \times 3 \, \text{h} = 270 \, \text{km} \)

The distance between them after 3 hours is the absolute difference between the distances traveled by the car and the bus: \[ \text{distance}_{\text{between}} = |270 \, \text{km} - 210 \, \text{km}| = 60 \, \text{km} \]

Method 2: Relative Speed

Another way to calculate the distance between the bus and the car after 3 hours is to use their relative speed.

The relative speed of the car with respect to the bus is \( 90 \, \text{km/h} - 70 \, \text{km/h} = 20 \, \text{km/h} \).

Using the relative speed and the time of 3 hours, we can calculate the distance between the bus and the car: \[ \text{distance}_{\text{between}} = \text{relative speed} \times \text{time} = 20 \, \text{km/h} \times 3 \, \text{h} = 60 \, \text{km} \]

Therefore, the distance between the bus and the car after 3 hours will be 60 km.