Question

От автобусной остановки одновременно в одном направление отъехали автобус и велосипедист. Скорость автобуса 45 км/ч, скорость велосипедиста 15 км/ч. Через какое время расстояние между ними будет равно 12км?

Answer 1

45*15=30
30х=12
х=12/30=0,4
0,4*60=24 минуты

Answer 2

Решение:
При решении этой задачи воспользуемся формулой:
S=V*t
Обозначим время, которое понадобится, чтобы расстояние между автобусом и велосипедистом было 12км за (х) час
Расстояние, прошедшее автобусом составит:
S1=45км/час*х=45х
А расстояние, прошедшее велосипедистом составит:
S2=15км/час*х=15х
И по условию задачи через х час расстояние должно быть 12км, следовательно  уравнение будет иметь вид:
45х-15х=12
30х=12
х=12/30=0,4 (час)
0,4 час*60мин=24 мин

Ответ: 24 мин

Answer 3

Problem Analysis

We are given that a bus and a cyclist start simultaneously from a bus stop in the same direction. The bus has a speed of 45 km/h, and the cyclist has a speed of 15 km/h. We need to determine the time it takes for the distance between them to be 12 km.

Solution

To solve this problem, we can use the formula: distance = speed × time.

Let's assume that the time it takes for the distance between the bus and the cyclist to be 12 km is t.

The distance traveled by the bus in time t is given by: distance_bus = speed_bus × t.

The distance traveled by the cyclist in time t is given by: distance_cyclist = speed_cyclist × t.

Since they start simultaneously, the distance traveled by the bus and the cyclist should be equal to 12 km:

distance_bus = distance_cyclist = 12 km.

Substituting the values, we get:

speed_bus × t = speed_cyclist × t = 12 km.

Given that the speed of the bus is 45 km/h and the speed of the cyclist is 15 km/h, we can rewrite the equation as:

45t = 15t = 12 km.

Simplifying the equation, we get:

30t = 12 km.

Solving for t, we divide both sides of the equation by 30:

t = 12 km / 30.

Calculating the value of t, we find:

t = 0.4 hours.

Therefore, it will take 0.4 hours (or 24 minutes) for the distance between the bus and the cyclist to be 12 km.

Answer

The time it takes for the distance between the bus and the cyclist to be 12 km is 0.4 hours or 24 minutes.