Question

Из города одновременно в протиположных направлениях выехали 2 автомобиля . скорость одного 80км/ч а скорость второго составляет 90% от скорости первого. На каком расстоянии будут автомобили через 40 мин!

Answer 1

Сперва узнаем скорость второго автомобиля
90% от 80
80:100x90- используем свойство, если число меньше ста.
Сейчас у нас число 80, в 100 два нуля, значит переносим запятую на два знака, покажу пошагово-80=8,0=0,8.И умножаем
0,8х90=72
Теперь мы знаем скорость второго автомобиля за час.
Мы знаем Скорость и Время- узнаем расстояние
1)80х40=3200
2)72х40=2880
3)3200-2880=320(км)
Ответ: на расстоянии 320км будут автомобили.
Если, что-то неправильно, просто точно помнить решение не могу

Answer 2

Calculation of the Distance between Two Cars

To calculate the distance between two cars that are traveling in opposite directions, we need to consider the speeds of both cars and the time they have been traveling. In this case, one car is traveling at a speed of 80 km/h, and the speed of the second car is 90% of the speed of the first car.

Given that the cars have been traveling for 40 minutes, we need to convert this time into hours. There are 60 minutes in an hour, so 40 minutes is equal to 40/60 = 2/3 hours.

To calculate the distance between the two cars, we can use the formula:

Distance = Speed × Time

Let's calculate the distance:

For the first car: - Speed = 80 km/h - Time = 2/3 hours

For the second car: - Speed = 90% of 80 km/h = 0.9 × 80 km/h = 72 km/h - Time = 2/3 hours

Now we can calculate the distances traveled by each car:

For the first car: Distance1 = Speed1 × Time = 80 km/h × (2/3) hours

For the second car: Distance2 = Speed2 × Time = 72 km/h × (2/3) hours

Let's calculate the distances:

Distance1 = 80 km/h × (2/3) hours = 160/3 km ≈ 53.33 km

Distance2 = 72 km/h × (2/3) hours = 144/3 km ≈ 48 km

Therefore, the two cars will be approximately 53.33 km apart after 40 minutes of traveling in opposite directions.