Question

Из Москвы в Санкт-Петербкрг выехали одновремено две машины: одна со скоростьб 90 км/ч, а другая со скоростью 78 км/ч. какое расстояние будет мкжду ними через полчаса? через час?

Answer 1

Решение:
(90+78):2=84(км)
Ответ:84 км будет расстояние между машинами!
Вроде правильно:)

Answer 2

Calculation of Distance between Two Cars

To calculate the distance between two cars that left Moscow for St. Petersburg simultaneously, we need to consider their speeds and the time elapsed.

Let's assume that Car A is traveling at a speed of 90 km/h, and Car B is traveling at a speed of 78 km/h.

After 30 minutes: To find the distance between the two cars after 30 minutes, we can use the formula: distance = speed × time.

For Car A: - Speed: 90 km/h - Time: 0.5 hours (30 minutes = 0.5 hours) - Distance covered by Car A after 30 minutes: 90 km/h × 0.5 hours = 45 km

For Car B: - Speed: 78 km/h - Time: 0.5 hours (30 minutes = 0.5 hours) - Distance covered by Car B after 30 minutes: 78 km/h × 0.5 hours = 39 km

Therefore, the distance between the two cars after 30 minutes is 45 km - 39 km = 6 km.

After 1 hour: To find the distance between the two cars after 1 hour, we can use the same formula: distance = speed × time.

For Car A: - Speed: 90 km/h - Time: 1 hour - Distance covered by Car A after 1 hour: 90 km/h × 1 hour = 90 km

For Car B: - Speed: 78 km/h - Time: 1 hour - Distance covered by Car B after 1 hour: 78 km/h × 1 hour = 78 km

Therefore, the distance between the two cars after 1 hour is 90 km - 78 km = 12 km.

Please note that these calculations assume constant speeds for both cars throughout the journey.