Question

Из одного пункта одновременно в противоположных направлениях отправились велосипед и пешеход.Пешеход двигался со скоростью 3км/ч, а велосипедист-- со скоростью в 4 раза больше.Какое расстояние будет между ними через 5 ч после начала движения?

Answer 1

Поскольку велосипедист и пешеход движутся в разных направлениях, то "скорость отдаления" будет равна сумме их собственных скоростей: v = 3 +3*4 = 3 + 12 = 15 (км/ч).
Тогда:
s = v*t = 15 * 5 = 75 (км).
Ответ: 75 км.

Answer 2

1) 3 * 4 = 12 (км/ч) - скорость велосипедиста
2) 3 + 12 = 15 (км/ч) - скорость расхождения
3) 15 * 5 = 75 (км)
Ответ: 75 км - расстояние между ними через 5 часов.

Answer 3

Problem Analysis

We are given that a pedestrian and a cyclist start from the same point in opposite directions. The pedestrian is moving at a speed of 3 km/h, while the cyclist is moving at a speed 4 times greater. We need to find the distance between them after 5 hours.

Solution

To find the distance between the pedestrian and the cyclist after 5 hours, we need to calculate the total distance covered by each of them.

Let's start by calculating the distance covered by the pedestrian. We know that the pedestrian is moving at a speed of 3 km/h, so in 5 hours, the pedestrian will cover a distance of 3 km/h * 5 h = 15 km.

Next, let's calculate the distance covered by the cyclist. We are given that the cyclist is moving at a speed 4 times greater than the pedestrian. Therefore, the cyclist is moving at a speed of 3 km/h * 4 = 12 km/h. In 5 hours, the cyclist will cover a distance of 12 km/h * 5 h = 60 km.

Finally, to find the distance between the pedestrian and the cyclist after 5 hours, we subtract the distance covered by the pedestrian from the distance covered by the cyclist. Therefore, the distance between them will be 60 km - 15 km = 45 km.

Answer: The distance between the pedestrian and the cyclist after 5 hours will be 45 km.

Conclusion

In this problem, we calculated the distance between a pedestrian and a cyclist after 5 hours. We found that the distance between them would be 45 km.